-
- -able and -ible
- -esque
A
- A cappella
- A la (à la)
- A leg up
- A lot vs. alot
- A priori
- A whole nother
- Abandon vs. abandonment
- Abbreviations, acronyms, and initialisms
- Abdicate, abnegate, abrogate
- Abecedarius
- Abided vs. abode
- Abjure vs. adjure
- Abolishment vs. abolition
- Aborted vs. abortive
- About-face
- Abstruse vs. obtuse
- Acclimate, acclimatise, acclimatize
- Accord vs. accordance
- Acephalous
- Achilles' heel
- Acknowledgement vs. acknowledgment
- Acquaintanceship
- Active voice vs. passive voice
- Ad hoc
- Ad hominem (usage)
- Ad infinitum
- Ad nauseam
- Adamance
- Adapter vs. adaptor
- Adaption vs. adaptation
- Addicting vs. addictive
- Addiction vs. dependence
- Addition vs. edition
- Adjectives
- Administrate
- Admission vs. admittance
- Adopted vs. adoptive
- Advance vs. advanced
- Adverbs
- Adverse vs. averse
- Advert vs. avert
- Advice vs. advise
- Adviser vs. advisor
- Aegis
- Aeon vs. eon
- Aeroplane vs. airplane
- Aesthetic vs. ascetic
- Affect vs. effect
- Afflict vs. inflict
- African-American vs. black
- Afterward vs. afterwards
- Afterward vs. afterword
- Ageing vs. aging
- Agent and recipient nouns
- Aggravate
- Aggression vs. aggressiveness
- Agnostic vs. atheist
- Ahold
- Aid vs. aide
- Ain't
- Aisle vs. isle
- Alas
- Albeit
- All but
- All in all
- All right vs. alright
- All together vs. altogether
- All-around, all-round
- Alligator vs. crocodile
- Allude vs. elude
- Allusion vs. elusion vs. illusion
- Already vs. all ready
- Altar vs. alter
- Alter ego
- Alternate vs. alternative
- Although vs. though
- Aluminium vs. aluminum
- Alumna, alumnae, alumni, alumnus
- Amalgam vs. amalgamation
- Ambiance vs. ambience
- Amend vs. emend
- American
- Amiable vs. amicable
- Amok vs. amuck
- Among vs. amongst
- Amoral vs. immoral
- Amount vs. number
- Ample
- Amuse vs. bemuse
- An historic
- Analog vs. analogue
- Analyse vs. analyze
- Anapest
- Anathema
- And yet
- Animal adjectives
- Annex vs. annexe
- Another think coming
- Antennae vs. antennas
- Anyplace
- Anytime vs. any time
- Anyway vs. anyways
- Apologise vs. apologize
- Apostrophe
- Apostrophe (poetry)
- Apotheosis
- Appeal to authority
- Appositives
- Appropriate vs. expropriate
- Apropos
- Argumentative vs. argumentive
- Armor vs. armour
- Around the clock, round the clock
- Around vs. round
- Arouse vs. rouse
- Arrant vs. errant
- Artefact vs. artifact
- As far as
- As per
- As yet, as of yet
- Ascared
- Ascent vs. assent
- Ascent, ascendance, ascendancy, etc.
- Asphalt, cement, concrete, pavement
- Assail vs. assault
- Assent vs. consent
- Assume vs. presume
- At loggerheads
- Attain vs. obtain
- Attend to vs. tend to
- Au contraire
- Auger vs. augur
- Aught
- Authorise vs. authorize
- Authoritative vs. authoritive
- Autumn vs. fall
- Auxiliary verbs
- Avail
- Avant-garde
- Avocation vs. vocation
- Awhile vs. a while
- Ax vs. axe
- Axel vs. axle
B
- Back up vs. backup
- Backyard, back yard, back-yard
- Bad rap vs. bad wrap
- Bail vs. bale
- Bailout, bail out, and bail-out
- Bait vs. bate
- Bald-faced vs. boldface
- Balmy vs. barmy
- Baloney vs. bologna
- Ban vs. bar
- Band (together) vs. bandy (about)
- Bankster
- Bar mitzvah and bat mitzvah
- Barbed wire
- Bard
- Bare vs. bear
- Basis (on a daily basis, on a regular basis, etc.)
- Bawl out
- Bazaar vs. bizarre
- Bear market, bull market, bearish, bullish
- Beckon call
- Beeline
- Beggar belief
- Begging the question (fallacy)
- Beg the question (usage)
- Behavior vs. behaviour
- Belated
- Belie
- Bellwether
- Bereaved vs. bereft
- Betwixt
- Beyond the pale
- Biceps and triceps
- Bid, bade, bidden
- Bight vs. bite
- Bit vs. bitten
- Blaspheme
- Blatant vs. flagrant
- Blather vs. blither
- Bloc vs. block
- Blond vs. blonde
- Blowout vs. blow out
- Blowup vs. blow up
- Boldface text
- Bona fide, bona fides
- Bore, boor, boar
- Borne vs. born
- Botanic vs. botanical
- Boughten
- Bourgeois, bourgeoisie
- Brainchild
- Breach, breech, broach
- Breath vs. breadth (vs. width)
- Breath vs. breathe
- Bridle vs. bridal
- Briton
- Broach vs. brooch
- Brouhaha
- Brung, brang
- Brussels sprout
- Buck naked, butt naked
- Buffer vs. buffet
- Build up vs. buildup
- Bulk, balk, baulk
- Bunk, bunkum, buncombe
- Bupkis
- Burgle vs. burglarize
- Burned vs. burnt
- Burnout vs. burn out
- Bursted
- Burthen
- Bus stop vs. busstop
- Buses vs. busses
- But vs. yet
- By and by vs. by the by
- By dint of
- Bête noire
C
- C'est la vie
- Cacao vs. cocoa
- Cache vs. cachet
- Cacti vs. cactuses
- Caddie vs. caddy
- Cahoots
- Callous vs. callus
- Calvary vs. cavalry
- Canard
- Canary in the coalmine
- Canceled vs. cancelled
- Canon vs. cannon
- Canvas vs. canvass
- Capital vs. capitol
- Card shark vs. card sharp
- Careen vs. career
- Carrot, carat, karat, caret
- Casted
- Catachresis
- Catalog vs. catalogue
- Catch-22
- Catty-corner, kitty-corner
- Caveat
- Cede vs. concede
- Center vs. centre
- Centrifugal vs. centripetal
- Centrifuge vs. subterfuge
- Centuries
- Certainty vs. certitude
- Cession vs. session
- Champing at the bit vs. chomping at the bit
- Chasten vs. chastise
- Check up vs. checkup
- Check vs. cheque
- Checkout vs. check out
- Cheek by jowl
- Cherry-pick
- Chic vs. sheik
- Childcare, child care, child-care
- Childish vs. childlike
- Chink vs. kink
- Chock-full
- Chopper vs. copter
- Classic vs. classical
- Clauses
- Clean vs. cleanse
- Cleanup vs. clean up
- Clench vs. clinch
- Client vs. customer
- Cliffs Notes
- Climactic vs. climatic
- Close rhyme
- Close-minded vs. closed-minded
- Co-op vs. co-opt
- Collective nouns
- College vs. university
- Collegial vs. collegiate
- Colon
- Color vs. colour
- Coliseum vs. colosseum
- Comedienne
- Comic vs. comical
- Commas
- Commentator vs. commenter
- Common French expressions
- Compel vs. impel
- Complacent vs. complaisant
- Complement vs. compliment
- Compose vs. comprise
- Concave vs. convex
- Conceive vs. perceive
- Concerning
- Concerted
- Condemn vs. condone
- Confidant vs. confidante
- Conjunctions
- Conjunctions to start sentences
- Connexion
- Connote vs. denote
- Contemporaneous vs. contemporary
- Contemptible vs. contemptuous
- Continual vs. continuous
- Contractions
- Contumely
- Conversate
- Cooperate vs. co-operate
- Coordinate adjectives
- Copyright vs. copywrite
- Coral vs. corral
- Cord vs. chord
- Cornet vs. coronet
- Corollary vs. correlation
- Cosmetology vs. cosmology
- Costed
- Cosy vs. cozy
- Could care less
- Council vs. counsel
- Counselor vs. counsellor
- Coup de grace
- Cover all the bases
- Crap
- Crapshoot
- Crayfish, crawfish, crawdad, etc.
- Cream of the crop
- Credible vs. credulous
- Creeped vs. crept
- Crevasse vs. crevice
- Crick (variant of creek)
- Crier vs. cryer
- Criteria, criterion
- Cue vs. queue
- Cum
- Curb vs. kerb
- Currently
- Cut and dried
- Cutesy
- Cyclist vs. biker
D
- D'oh
- Dactyl
- Dam vs. damn
- Dampen, damper, dampener
- Danglers
- Daresay
- Data
- Dates and commas
- Davy Jones's locker
- Day in age (day and age)
- De facto
- De rigueur
- Dead set, dead-set, deadset
- Dealt vs. dealed
- Dearth
- Decent vs. descent
- Deceptively
- Decidedly
- Decimate
- Deconstruction
- Decry vs. descry
- Deduce vs. induce
- Deep-seeded vs. deep-seated
- Defence vs. defense
- Definite articles
- Defuse vs. diffuse
- Deign
- Demur vs. demure
- Dependant vs. dependent
- Deprecate vs. depreciate
- Derring-do
- Descendant vs. descendent
- Despite vs. in spite of
- Destroy vs. destruct
- Detract vs. distract
- Device vs. devise
- Dialectal vs. dialectical
- Dice vs. die
- Dike vs. dyke
- Dilemma
- Directional words
- Dis vs. diss
- Disassemble vs. dissemble
- Disburse vs. disperse
- Disc vs. disk
- Discombobulate
- Disconnect
- Discrete vs. discreet
- Disillusion vs. dissolution
- Dispatch vs. despatch
- Dispense with vs. dispose of
- Disposed vs. predisposed
- Dissociate vs. disassociate
- Distinct vs. distinctive
- Distrust vs. mistrust
- Divers vs. diverse
- Divorcée, divorcé, divorcee
- Do apologize
- Dog days
- Dog-eat-dog
- Dole out vs. doll out
- Doppelgänger
- Double entendre
- Double vs. redouble
- Doubtlessly
- Doughnut vs. donut
- Douse vs. dowse
- Dove vs. dived
- Down the pike vs. down the pipe
- Downfall vs. downside
- Draft vs. draught
- Dragged vs. drug
- Dreamed vs. dreamt
- Dribble vs. drivel
- Dribs and drabs
- Drier vs. dryer
- Drink the Kool-Aid
- Droll
- Du jour
- Dual vs. duel
- Duly noted
- During the course of
- Dwarfs vs. dwarves
- Dwelled vs. dwelt
- Dyed in the wool
- Dyeing vs. dying
E
- E-book, ebook, eBook
- E-mail vs. email
- E. coli
- E.g. vs. i.e.
- Each other vs. one another
- Earth (capitalization)
- Earthy vs. earthly
- Economic vs. economical
- Economics vs. finance
- Eek vs. eke
- Elder, eldest
- Electric, electrical, electronic
- Elegy vs. eulogy
- Elicit vs. illicit
- Ellipsis
- Elocution vs. locution
- Em dash (Em rule)
- Emigrate vs. immigrate
- Empathetic vs. empathic
- Empathy vs. sympathy
- En route
- En dash (En rule)
- Enclose vs. inclose
- Endear
- Endeavor vs. endeavour
- Endemic vs. epidemic
- Enervate
- Enervate vs. innervate
- England, Great Britain, United Kingdom
- English in flux: 10 word peeves that should be laid to rest
- English moods (imperative, indicative, and subjunctive)
- Engrain vs. ingrain
- Enormity vs. enormousness
- Enquire vs. inquire
A
- Assure, ensure, insure
E
- Enthuse
- Entitled vs. titled
- Entomology vs. etymology
- Envelop vs. envelope
- Envision vs. envisage
- Envision vs. invision
- Envoi vs. envoy
- Epicenter
- Epigram vs. epigraph
- Eponymous
- Equable, equatable, equitable
- Equivalence vs. equivalency
- Ere vs. err
- Ergo
- Ersatz
- Especial
- Espresso vs. expresso
- Esprit de corps
- Estimate vs. estimation
- Et al.
- Et cetera (etc.)
- Ethics vs. morals
- Ethnicity vs. race
- Evacuate
- Everyday vs. every day
- Everything happens for a reason
- Evoke vs. invoke
- Ex post facto
- Exalt vs. exult
- Exclamation point
- Exercise vs. exorcise
- Exhibit vs. exhibition
- Existential
- Expectant vs. expecting
- Exploitative vs. exploitive
F
- Factoid
- Fain vs. feign
- Fair vs. fare
- Fait accompli
- Falsehood, falsity, falseness
- Fantods
- Far East, Middle East, Near East
- Farther vs. further
- Fastly
- Faux
- Faux pas
- Favor vs. favour
- Favorite vs. favourite
- Faze vs. phase
- Fearful vs. fearsome
- Feminity vs. femininity
- Ferret out
- Fervent vs. fervid
- Fay, fey
- Fiancé and fiancée
- Fiber vs. fibre
- Fiction vs. nonfiction
- Fictional vs. fictitious
- Figurehead
- Filet vs. fillet
- Financer vs. financier
- Firefight
- Firing line vs. line of fire
- First-world, third-world
- Firstly, secondly, thirdly, etc.
- Fish vs. fishes
- Fit vs. fitted
- Flack vs. flak
- Flair vs. flare
- Flammable vs. inflammable
- Flash in the pan
- Flaunt vs. flout
- Flautist vs. flutist
- Flavor vs. flavour
- Flesh out vs. flush out
- Fleshly vs. fleshy
- Flied
- Flier vs. flyer
- Flora and fauna
- Flotsam and jetsam
- Flounder vs. founder
- Flu vs. flue
- Follow up, follow-up, followup
- Foolproof vs. full-proof
- Foot
- Football fields
- For all intensive purposes (for all intents and purposes)
- For God's sake
- For heaven's sake
- For the purpose of
- Forbear vs. forebear
- Forbidding vs. foreboding
- Force majeure
- Forego vs. forgo
- Foreword vs. forward
- Former, latter
- Fortuitous vs. fortunate
- Forty vs. fourty
- Foul vs. fowl
- Frankenstein's monster
- Fraught
- Free rein vs. free reign
- French accent marks
- French alphabet pronunciation
- French days and months
- French definite articles
- French greetings and salutations
- French indefinite articles
- French noun gender
- French numbers
- French partitive article
- Freshwater vs. fresh water
- Fritter away
- Frivolity vs. frivolousness
- Fueled/fueling vs. fuelled/fuelling
- Fulfil vs. fulfill
- Full stop vs. period
- Full-fledged, fully fledged
- Fulsome
- Funereal
- Funner, funnest
- Furor vs. furore
G
- Gaff vs. gaffe
- Gainsay
- Galore
- Gambit
- Gantlet vs. gauntlet
- Gaol vs. jail
- Gargle vs. gurgle
- Gases vs. gasses
- Gaudy vs. gawdy
- Gay
- Gender vs. sex
- Gerunds
- Gesundheit
- Get down to brass tacks
- Get religion
- Gibe, jibe, jive
- Gift (as a verb)
- Gild vs. guild
- Gimme
- Ginormous
- Glad-hand
- Glamour vs. glamor
- Glom onto
- Gobbledygook
- Gobsmacked
- God (capitalization)
- Godspeed
- Goes without saying
- Gonna
- Goodly
- Gorilla vs. guerrilla
- Governance vs. government
- Grammar vs. usage
- Grammarly doesn't do all it claims to do
- Grandfather (as a verb)
- Gray vs. grey
- Grill vs. grille
- Grinded
- Grisly vs. grizzly
- Guesstimate
- Gymnasia vs. gymnasiums
H
- Habeas corpus
- Hail vs. hale
- Hair's breadth (hare's breath)
- Half-mast vs. half-staff
- Halve
- Handful, handfuls
- Handicap vs. handicapped
- Hands down
- Hangar vs. hanger
- Hanged vs. hung
- Happenstance
- Hara-kiri
- Harbor vs. harbour
- Hardy vs. hearty
- Hare vs. rabbit
- Hairbrained vs. harebrained
- Hark, harken, and hearken
- Hawk vs. hock
- Healthcare vs. health care
- Healthful vs. healthy
- Hear, hear vs. here, here
- Heighth
- Hence
- Heroin vs. heroine
- Heterogeneous vs. heterogenous
- Heterometric
- Hew vs. hue
- Hie
- Highfalutin
- Hippopotami, hippopotamuses, hippos
- Historic vs. historical
- Histrionic, histrionics
- Hoard vs. horde
- Home in vs. hone in
- Homely vs. homey
- Homo sapiens
- Homogenous vs. homogeneous
- Honor vs. honour
- Hoosegow
- Hoover vs. vacuum
- Horsey, horsy, horsie
- Hosanna
- Hullabaloo
- Humongous
- Humor vs. humour
- Humorousness
- Humus vs. hummus
- Hunter-gatherer
- Hurdle vs. hurtle
- Hurrah, hooray, hurray
- Hyphen
I
- Ice tea vs. iced tea
- Idea vs. ideal
- Ideogram
- Idle, idol, idyll
- If you will
- Ilk
- Illegible vs. unreadable
- Imagism
- Immaculate Conception vs. virgin birth
E
- Eminent vs. immanent vs. imminent
I
- Immunity vs. impunity
- Impactful
- Impassable vs. impassible
- Impassive vs. passive
- Impending vs. pending
- Imperious vs. impervious
- Impinge vs. infringe
- Imply vs. infer
- Impugn vs. impute
- In excess of
- In terms of
- In the affirmative
- In the course of
- In the midst of
- In the offing
- In the process of
- In the throes of
E
- En vogue, in vogue
I
- Inalienable vs. unalienable
- Incipient vs. insipient (vs. insipid)
- Inclement vs. inclimate
- Incomparable vs. uncomparable
- Incredible vs. incredulous
- Incubus, succubus
- Indefinite articles
- Indexes vs. indices
- Inequality vs. inequity
- Inequity vs. iniquity
- Infect vs. infest
- Ingenious vs. ingenuous
- Inside baseball
- Insofar (in so far)
- Installation vs. installment
- Instantly vs. instantaneously
- Instinctive vs. instinctual
- Intact
- Inter-, intra-
- Intercourse
- Interjections
- Interment vs. internment
- Internet (capitalization)
- Interpretative vs. interpretive
- Invaluable vs. valuable
- Ipso facto
- Ironic
- Ironical
- Irregardless
- Irregular plural nouns
- Isometric
- Italics (when to italicize)
- Iteration
- Its vs. it's
J
- Jam vs. jamb
- Jeremiad
- Jewelry vs. jewellery
- Judgment vs. judgement
- Junction vs. juncture
- Junkie vs. junky
- Jury-rig, jerry-rig, jerry-built
- Just deserts vs. just desserts
K
- Kaput
- Ketchup, catsup, catchup
- Kibosh
- Kick off vs. kickoff (vs. kick-off)
- Kick the can down the road
- Klutz
- Knee-jerk, kneejerk
- Knit vs. knitted
- Kowtow
- Kudos
L
- Labeled vs. labelled
- Labor vs. labour
- Laissez-faire
- Lambast vs. lambaste
- Landlubber
- Lasagna vs. lasagne
- Laudable vs. laudatory
- Lay vs. lie
- Lead vs. lede
- Leaped vs. leapt
- Learned vs. learnt
- Led vs. lead
- Leftover vs. left over
- Lend vs. loan
- Lended vs. lent
F
- Fewer vs. less
L
- Lest
- Levee vs. levy
- Libel vs. slander
- Licence vs. license
- Licorice vs. liquorice
- Light vs. lite
- Lighted vs. lit
- Lightening vs. lightning
- Likable vs. likeable
- Like gangbusters
- Linchpin vs. lynchpin
- Liter vs. litre
- Literally vs. figuratively
- Litmus test
- Lo, lo and behold
- Loath vs. loathe (vs. loth)
- Log in vs. log on
- Lonely vs. lonesome
- Longetivity vs. longevity
- Look out vs. lookout (vs. look-out)
- Loose vs. lose
- Lorry
- Lowlife
- Luddite
- Lustful vs. lusty
- Luxuriant vs. luxurious
M
- Macintosh, mackintosh, McIntosh
- Magnate vs. magnet
- Magnum opus
- Make do vs. make due
- Make hay
- Maleficent vs. malevolent
- Mancession
- Maneuver vs. manoeuvre
- Mantel vs. mantle
- Marinade vs. marinate
- Marshal vs. martial
- Masterful vs. masterly
- Materiel vs. material
- Math vs. maths
- Maul vs. mull
- Mayonnaise vs. mayonaise
- Mea culpa
- Meager vs. meagre
- Means
- Medal, meddle, metal, mettle
- Media vs. mediums
- Mediator vs. moderator
- Melted vs. molten
- Mensch
- Meta
- Metaphoric vs. metaphorical
- Meteoroid, meteor, meteorite (and meteoric)
- Meter vs. metre
- Methinks
- Mic vs. mike
- Mice vs. mouses
- Midrift (midriff)
- Milieu
- Minuscule vs. miniscule
- Minutia, minutiae
- Mirandize
- Mischievous vs. mischievious
- Modern
- Modus operandi (m.o, MO)
- Mold vs. mould
- Mollycoddle
- Molt vs. moult
- Momentarily
- Money-grabbing vs. money-grubbing
A
- Ape vs. monkey
M
- Moot vs. mute
- Morays vs. mores
- Moreso
- Mothball
- Mother lode
- Movable vs. moveable
- Mowed vs. mown
- Muchly
- Mucous vs. mucus
- Murderers' row
- Must of (must've)
- Moustache vs. mustache (vs. mustachio)
- Muumuu
- Myriad
N
- Namesake
- Nary a
- Naught vs. nought
- Nauseating vs. nauseous
- Naval vs. navel
- Neandertal vs. neanderthal
- Neck and neck
- Negative prefixes
- Neighbor vs. neighbour
- Newfangled
- Nimby, nimbyism
- Nip in the bud
- No one vs. noone (vs. no-one)
- Non sequitur
- Nonprofit vs. not-for-profit (vs. non-profit)
- Nonfinite verbs
- Nonplussed
- Normalcy vs. normality
- Not hardly
- Not un-
- Notwithstanding
- Nouns
- Nouns as adjectives
- Numerals
O
- O vs. oh
- Object lesson
- Objects
- Observance vs. observation
- Obsolescent vs. obsolete
- Ocher vs. ochre
- Octopi vs. octopuses
- Odor vs. odour
- Off of
- Off the cuff
- Offence vs. offense
- Offhand
- Oftentimes
- Oh well
- OK vs. okay
- Olive branch
- Omelet vs. omelette
- On steroids
- On tenterhooks
- On the fritz
- On the lam
- On the up and up
- On the wagon, off the wagon
- Onboard vs. on board
- One fell swoop
- One and the same, one in the same
- One-time vs. onetime
- Oneself vs. one's self
- Online vs. on-line
- Onus
- Opossum vs. possum
- Oppress, repress, suppress
- Oral vs. verbal
- Ordinance vs. ordnance
- Organise vs. organize
- Orientate
- Ouster
- Out and out
- Out of pocket
- Outside of
- Over- and under- (prefixes)
- Overly
- Overnight vs. over night
- Overtones vs. undertones
- Oxymorons
P
- Paddy wagon
- Paean, paeon, peon
- Pajamas vs. pyjamas
- Palate, palette, pallet
- Palindrome (poetry)
- Par excellence
- Paralyse vs. paralyze
- Paramount vs. tantamount
- Parentheses (round brackets)
- Parricide vs. patricide
- Part and parcel
- Participial prepositions
- Participles
- Pass the buck, the buck stops
- Passed vs. past
- Patsy
- Payback vs. pay back
- Peace of mind, piece of (one's) mind
- Peaceable vs. peaceful
- Peak vs. peek vs. pique
- Peal vs. peel
- Pedal vs. peddle vs. petal
- Pell-mell
- Penal vs. penile
- Pendant vs. pendent
- People vs. persons
- Per diem
- Per se
- Percent vs. per cent
- Perchance
- Perfect storm
- Period (full stop or full point)
- Periodic vs. periodical
- Pernickety vs. persnickety
- Perquisite vs. prerequisite (vs. requisite)
- Persecute vs. prosecute
- Persona non grata
- Peruse
- Phenomena, phenomenon
- Phony vs. phoney
- Phosphorous vs. phosphorus
- Phrasal adjectives
- Phrasal prepositions
- Phrasal verbs
- Phrases
- Picaresque vs. picturesque
- Pickup vs. pick up (vs. pick-up)
- Pincer vs. pincher
- Pixelated vs. pixilated
- Plain vs. plane
- Plainclothes
- Plateaus vs. plateaux
- Playwright vs. playwrite
- Pleaded vs. pled
- Plenitude vs. plentitude
- Plethora
- Plough vs. plow
- Plum vs. plumb
- Point in time
- Point of view, standpoint, viewpoint
- Poisoning the well
- Polemic vs. polemical
- Politics
- Pollyanna
- Polygamy vs. polygyny vs. polyandry
- Pompom vs. pompon (vs. pom-pom etc.)
- Ponderous
- Poo vs. pooh
- Populace vs. populous
- Pore over vs. pour over
- Port vs. starboard
- Portend vs. portent
- Poster child
- Postpositive adjectives
- Potentiality
- Practicable vs. practical
- Practice vs. practise
- Pray vs. prey
- Precede vs. proceed
- Predicate nominatives
- Premier vs. premiere
- Preposition vs. proposition
- Prepositions
- Prescribe vs. proscribe
- President (capitalization)
- Presumptive vs. presumptuous
- Pretence vs. pretense
- Preventative vs. preventive
- Principal vs. principle
- Previous vs. prior
- Privacy policy
- Proactive
- Problematic vs. problematical
- Procrastinate
- Prodigal son
- Program vs. programme
- Pronouns
- Proof by example
- Prophecy vs. prophesy
- Proportional vs. proportionate
- Props
- Perspective vs. prospective
- Prostate vs. prostrate
- Protagonist, antagonist
- Protégé
- Proved vs. proven
- Psych vs. psyche
- Psychiatry vs. psychology
- Pull the rug out from under
- Pullout, pull-out, pull out
- Purposely vs. purposefully
Q
- Qualitative, quantitative
- Qualitative vs. qualitive
- Quantitative vs. quantitive
- Quash vs. squash
- Quasi
- Question mark
- Quick entries: A
- Quick entries: B
- Quick entries: C
- Quick entries: D
- Quick entries: E
- Quick entries: F
- Quick entries: G
- Quick entries: H
- Quick entries: I
- Quick entries: J, K, L
- Quick entries: M
- Quick entries: N
- Quick entries: O
- Quick entries: P-Q
- Quick entries: R
- Quick entries: S
- Quick entries: T
- Quick entries: U-V
- Quick entries: W, X, Y, Z
- Quid pro quo
- Quisling
- Quotation marks
R
- Rack vs. wrack
- Racket vs. racquet
- Radical
- Raison d'etre
- Rappel vs. repel
- Rapt vs. wrapt
- Raring to
- Ravaging vs. ravishing
- Re-create vs. recreate
- Reactionary vs. reactive
- Realise vs. realize
- Reappropriate
- Rearranging the deck chairs on the Titanic
- Recur vs. reoccur
- Red herring
- Regard vs. regards
- Regime vs. regimen
- Regrettable vs. regretful
- Relevance vs. relevancy
- Remunerate vs. renumerate
- Repel vs. repulse
- Resilience vs. resiliency
- Respective, respectively
- Restaurateur vs. restauranteur
- Restrictive and nonrestrictive
- Retard
- Retch vs. wretch
- Ridded
- Rife vs. ripe
- Riff vs. rift
- Riffraff
- Right-of-way
- Righten
- Ring vs. wring
- Rock 'n' roll, rock and roll, rock'n'roll, etc.
- Rogue vs. rouge
- Role vs. roll
- Rollout vs. roll out
- Rollover vs. roll over
- Root vs. route vs. rout
T
- Tough row to hoe
R
- Rubenesque
- Rule of thumb
- Rumor vs. rumour
- Run-on sentences
- Runaway vs. run away
- Résumé
S
- Saccharin vs. saccharine
- Sacrilege, sacrilegious
- Safe-deposit box
- Said
- Saltwater vs. salt water
- Sans
- Savanna vs. savannah
- Savior vs. saviour
- Savoir faire
- Scarfs vs. scarves
- Sceptic vs. skeptic
- Schadenfreude
- Scissors
- Scot-free
- Scuttlebutt
- Seasons (capitalization)
- Secede vs. succeed
- Secret vs. secretive
- Seldomly
- Semicolon
- Sensual vs. sensuous
- Sentence-ending prepositions
- Sentences
- Sentient
- Series
- Service (as a verb)
- Sew vs. sow
- Shanghai (as a verb)
- Shat vs. shitted
- Shaved vs. shaven
- Sheath vs. sheathe
- Shed vs. shedded
- Shelf vs. shelve
- Sherbert vs. sherbet
- Shined vs. shone
- Shoo-in
- Short shrift
- Showrunner
- Shtick
- Sic
- Sic vs. sick
- Sight vs. site
- Silicon vs. silicone
- Sine qua non
- Skilful vs. skillful
- Slam dunk
- Sleight of hand
- Smelled vs. smelt
- Smite, smote, smitten
- Smoothe, smoothen
- Smorgasbord
- Sneaked vs. snuck
- So to speak
- Soldiers, marines, airmen, sailors
- Somber vs. sombre
- Some odd
- Somebody vs. someone
- Someday vs. some day
- Someplace vs. some place
- Somersault
- Sometime vs. some time
- Some way vs. someway
- Sooner rather than later
- Sort of
- Soup up
- Sow wild oats
- Spaces between sentences
- Spatter vs. splatter
- Speak to
- Speciality vs. specialty
- Species
- Specter vs. spectre
- Spectra vs. spectrums
- Sped vs. speeded
- Spelled vs. spelt
- Spendthrift
- Spilled vs. spilt
- Spit and image vs. spitting image
- Split infinitives
- Spoiled vs. spoilt
- Spreaded
- Spur vs. spurn
Q
- Quelch vs. squelch
S
- Stadia vs. stadiums
- Stained glass
- Stalactite, stalagmite
- Stanch vs. staunch
- Standby vs. stand by
- Stank, stunk
- Star-crossed
- State of the art
- Stationary vs. stationery
- Status quo
- Statute of limitations
- Sticktoitiveness
- Stock, shares
- Storey vs. story
- Straight vs. strait
- Strait-laced
- Straitjacket
- Stratagem vs. strategy
- Straw man fallacy
- Strived, striven, strove
- Subconscious vs. unconscious
- Subjects and predicates
- Subjunctive mood
- Substantial vs. substantive
- Subtle vs. subtil
- Suffice it to say
- Suffixes
- Sui generis
- Sulfur vs. sulphur
- Summons and summonses
- Supposably
- Supposed to
- Surveil
- Svengali
- Swath vs. swathe
- Sweat vs. sweated
- Synecdoche
- Synonyms
- Systematic vs. systemic
T
- T-shirt, t-shirt, tee-shirt, tee shirt
- Tack vs. tact
- Tail vs. tale
- Takeaway and takeout
- Taken aback
- Teeth vs. teethe
- Teetotaler, teetotaller
- Telegram vs. telegraph
- Tenant vs. tenet
- Terminate
- Terza rima
- Testament vs. testimony
- Tete-a-tete
- Textish
- Than vs. then
- That vs. which
- That vs. who
- That which
- The $64,000 question
- The Bronx
- The die is cast
- The late
- The rub
- Theater vs. theatre
- Their, there, they're
- Therefore
- Their, them, themselves, they (as singular pronouns)
- Third rail
- Tho, altho
- Through vs. thru
- Throw under the bus
- Thrust, thrusted
- Thusly
- Tic vs. tick
- Tidbit vs. titbit
- Timber vs. timbre
- Timeout vs. time out
- Tire vs. tyre
- Title capitalization
- To a T
- To boot
- To vs. too
- To wit
- Toe the line
- Toilette
- Tolerance vs. toleration
- Ton vs. tonne
- Tongue-in-cheek
- Topography vs. typography
- Torturous vs. tortuous
- Tour de force
- Toward vs. towards
- Toxicology vs. toxology
- Transgender, transsexual, transvestite
- Translucent vs. transparent
- Transpire
- Transport vs. transportation
- Traveled/traveling vs. travelled/travelling
- Trawl vs. troll
- Treasurys
- Treble vs. triple
- Trochee
- Troop vs. troupe
- Truck with
- Trustee vs. trusty
- Tsk-tsk
- Turbid, turgid, torpid
- Turtle, tortoise, terrapin
U
- U.S. state demonyms
- Uber
- Unawares
- Uncomparable adjectives
- Underwater vs. under water
- Underway vs. under way
- Undoubtably vs. undoubtedly
- Unique
- United States (plural or singular?)
- Unkempt, unkept
- Unknown quantity
- Unputdownable
T
- Till, until, 'til
U
- Untoward
- Up to date
- Upfront vs. up front
- Upmost vs. utmost
- Upshot
- Used to
- Usually always
V
- Vagina vs. vulva
- Vain, vein, and vane
- Vamoose
- Vacuous vs. vapid
- Veracity vs. voracity
- Verbiage
- Verbs
- Verses vs. versus
- Vertex vs. vortex
- Very
- Vice president (capitalization and hyphenation)
- Vice versa
- Vice vs. vise
- Vicious vs. viscous
- Virgule
- Vis-a-vis
- Viz.
- Voicemail
- Voilà
- Vouchsafe
W
- Wack vs. whack
- Waddle vs. wattle
- Wagon vs. waggon
- Waive vs. wave
- Waiver vs. waver
- Wander vs. wonder
- Wane, wax
- Wanton vs. wonton
- Warrantee vs. warranty
- Wary vs. weary
- Weaved, wove, woven
- Web site vs. website
- Website vs. web page
- Well-heeled
- Welsh
- Wet vs. whet
- Whac-A-Mole
- Whatnot
- Whence vs. from whence
- Whereas
- While away vs. wile away
- Whilst
- Whinge
- Whiny, whiney, whinny, Whinney
- Whiskey vs. whisky
- Whiz, whizz, wiz
- Who vs. whom
- Who's vs. whose
- Who's Who
- Whoever vs. whomever
- Whoop vs. whup
- Widow, widower
- Wilful vs. willful
- Winningest
- Wit vs. whit
- Wither vs. whither
- Wont
- Woolen vs. woollen
- Workout vs. work out
- Worse comes to worst
- Wreak havoc (and wreaked vs. wrought)
- Wreath vs. wreathe
- Write-off vs. write off
- Wrong vs. wrongly
- Wunderkind
Y
- Y'all
- Yea, yeah, yay
- Yoghurt vs. yogurt
- Yoke vs. yolk
- You (in formal writing)
- Your vs. you're
Z
- Zee vs. zed
- Zeitgeist
- Zero-sum game
