E. B. White
Elements of Style: Words often Misspelled
VI. WORDS OFTEN MISSPELLED
accidentally formerly privilege
advice humorous pursue
affect hypocrisy repetition
beginning immediately rhyme
believe incidentally rhythm
benefit latter ridiculous
challenge led sacrilegious
criticize lose seize
deceive marriage separate
definite mischief shepherd
describe murmur siege
despise necessary similar
develop occurred simile
disappoint parallel too
duel Philip tragedy
ecstasy playwright tries
effect preceding undoubtedly
existence prejudice until
fiery principal
Write to-day, to-night, to-morrow (but not together) with hyphen.
Write any one, every one, some one, some time (except the sense of formerly) as two words.