- All right vs. alright
- All together vs. altogether
- Already vs. all ready
- Awhile vs. a while
- Back seat vs. backseat
- Back up vs. backup
- Backyard, back yard, back-yard
- Bailout, bail out, and bail-out
- Beeline
- Blowout vs. blow out
- Blowup vs. blow up
- Build up vs. buildup
- Burnout vs. burn out
- Bus stop vs. busstop
- Check in vs. check-in (vs. checkin)
- Check up vs. checkup
- Childcare, child care, child-care
- Cleanup vs. clean up
- Everyday vs. every day
- Follow up, follow-up, followup
- Freshwater vs. fresh water
- Healthcare vs. health care
- Home school vs. homeschool (vs. home-school)
- Hunter-gatherer
- Knee-jerk, kneejerk
- Lay out vs. layout
- Leftover vs. left over
- Log in vs. login
- Look out vs. lookout (vs. look-out)
- No one vs. noone (vs. no-one)
- Offhand
- Onboard vs. on board
- One-time vs. onetime
- Oneself vs. one's self
- Overnight vs. over night
- Payback vs. pay back
- Photo shoot vs. photoshoot
- Pickup vs. pick up (vs. pick-up)
- Pullout, pull-out, pull out
- Real-time vs. real time
- Right-of-way
- Rollout vs. roll out
- Rollover vs. roll over
- Runaway vs. run away
- Saltwater vs. salt water
- Set up vs. setup
- Someday vs. some day
- Sometime vs. some time
- Standby vs. stand by
- Take over vs. takeover
- Timeout vs. time out
- Underwater vs. under water
- Underway vs. under way
- Upfront vs. up front
- Voicemail
- Website vs. web page
- Well-being vs. wellbeing
- Workout vs. work out
- Write-off vs. write off
