Grisly vs. grizzly
Grizzly = (1) grayish or flecked with gray, and (2) of or relating to the large brown bear native to western North America. Grisly = gruesome, ghastly, or inspiring repugnance.
What Is a Mumu, Muumuu or Moomoo Dress? – Meaning and Origin
It prevails over all alternative spellings by a large margin.
Bore, boor, boar
Bore = something boarding. Boor = a clumsy or ill-mannered person. Boar = a wild pig.
Crack down vs. crackdown
Crackdown (noun): an official effort to forcefully repress or restrain something. Crack down (verb): to commit a crackdown.
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Sulfur vs. sulphur
sulfur in the U.S. and in most scientific publications internationally; usually sulphur in nonscientific writing outside the U.S.
Caesarean section, Caesarian, cesarean, etc.
In general usage, Caesarean is the usual spelling (capitalized in North America, uncapitalized everywhere else). In medical usage, cesarean is the standard form.