Words commonly misspelled, or spelled correctly but not used properly:
Note: these are American spellings!

A: absence, accidentally, accommodate/accommodation, according, ache, acquit/acquire, again, against, aisle, allegory, almost, always, although, ancient, airplane, aging, agonize, apologize

B: beautiful, beginning, believe, bellwether, body, build, business

C: calendar, consensus, cemetery, changeable, confidence, conscience/conscientious/conscious, coolly, criticize

D: decided, defendant, describe, despair, difference, dilemma, disappear, disappoint, disguise, distance, divide, double, drunkenness, dumbbell

E: easiness, embarrass, exceed, exhilarate, existence

F: familiar, famous, finish, foreign, forest, from/form

G: gauge, government, grateful, guarantee, guardian, guest, guilty

H: halve, happened, harass, height, here/hear, high

I: illegible, imagine, immediately, independent, indispensable, information, inoculate, instead, interest, irresistible

J: jewelry, judgment, juice

K: kernel/colonel, knowledge

L: language, league, leisure, license, liquefy, a lot, listen

M: machine, maintenance, meant, measure, medieval, memorandum, merchandise, millennium, mischievous, misspell, month, mountain

N: necessary, neighbor, neither, nighttime, noticeable

O: occurrence, occasion/occasionally

P: paragraph, pastime, period, phrase, playwright, possible, precede, preferred, pressure, principal/principle, privilege, prominent, purchase, purpose, pursue

Q: quite, quiet, queue, questionnaire

R: receipt, receive, recommend, reference, referred, region, relevant, remember, rhyme, rhythm

S: says, separate, sergeant, several, similar, sincerely, soldier, sugar, sure,

T: temperature, theater, there/their/they’re, thousands, thorough, threshold, to/two/too, tomorrow, tournament, truly, tyranny

U: unanimous, unforgettable, unfortunately, until, usually

V: vacuum, variety, various, vary, vehicle, vicious, village, villain

W: wear/where/we’re, weird, weather/whether

X:

Y: yacht, yield

Z: zucchini