Set of words that are often confused, such as capital and capitol.
| a lot (not alot) | ability | absence |
| accept | accessible | accidentally |
| accommodate | accumulate | accuracy |
| achievement | acknowledgment | acquaintance |
| acquire | acquitted | actionable |
| ad nauseam | adjournment | advantageous |
| adverse | advise | adviser (not advisor) |
| advisory | affidavit | affiliated |
| afterward (not afterwards) | aggravate | aggressive |
| align | all right (not alright) | alumnae (feminine) |
| alumnus, alumni (masculine); alumna, | amateur | amid (not amidst) |
| among (not amongst) | analysis | analyze |
| anonymous | apparatus | apparent |
| applicable | approximately | apropos |
| ascertain | auxiliary | averse |
| ax (not axe), axed | axing | bankruptcy |
| beneficial | bona fide | bookkeeping |
| brochure | bureau | business |
| calendar | cancellation | cannot (one word) |
| capacity | capital | capitol |
| Caribbean | censure | changeable |
| changeover | chargeable | Cincinnati |
| clientele | climactic | column |
| committee | comparative | competent |
| competition | complacent | complement |
| compliment | comptroller | condemn |
| Connecticut | connote | conscience |
| conscientious | conscientious | conscious |
| conscious | consensus | contemptible |
| continual | correlate | counterfeit |
| courteous | credible | criterion |
| criticism | deceive | defendant |
| dependent | desperate | dilemma |
| diligence | disbursement | disillusioned |
| dissatisfied | dive, dived, diving | egregious |
| embarrass | encyclopedia | endeavor |
| enormity | enthused | entitled |
| erroneous | exaggerate | exaggerate |
| excellent | except | exhilaration |
| existence | existence | explanation |
| extraordinary | eye, eyed, eyeing | facilitate |
| facsimile | familiar | fascinate |
| fascinating | feasible | fictitious |
| finally | financier | flack vs. flak |
| fluorescent | forcibly | foreigh |
| fortuitous | forward (not forwards) | gauge |
| grievance | guarantee | harass |
| humorous | inasmuch as | index, indexes, |
| indices | indiscreet | indispensable |
| ingenious | installation | interrupt |
| irregardless | jeopardy | judgment |
| justifiable | leisure | liaison |
| license | lieutenant | likable (not likeable) |
| loath | maintenance | manageable |
| maneuver | meager | Mediterranean |
| memento (not momento) | mileage | millennium |
| millionaire | minuscule (not miniscul) | miscellaneous |
| mortgage | naval | necessary |
| niece | ninety | ninth |
| nauseated | noticeable | nowadays |
| nucieus | obsession | occasion |
| occasionally | occurred | occurrence |
| omission | omitted | opinion |
| okay | opportunity | optimistic |
| outrageous | pageant | permanent |
| permissible | persecute | persistent |
| phenomenon | possession | posthumous |
| potato, potatoes | precede | prejudice |
| prescription | prevalent | prima-facie |
| privilege | proviso, provisos | questionnaire |
| recommend | referral | referred |
| relevant | remembrance | reminisce |
| repetition | restaurant | restaurateur |
| rhyme | rhythm | ridiculous |
| sacrifice | sacrilegious | salable (preferred, although saleable not incorrect) |
| sandwich | satisfactorily | schedule |
| secretary | seize | seize |
| semiannual | separate | serviceable |
| simultaneous | sizable | subpoena |
| subtle | succeed | successor |
| supersede | supervisor | susceptible |
| suspicious | technique | tendency |
| Tennessee | total, totaled, totaling | toward (not towards) |
| transferring | twelfth | unanimous |
| unnecessary | upward (not upwards) | usable |
| vendor | veto, vetoes, vetoed | vetoing |
| villain | wholly | zero, zeroes |
Modal auxiliaries are used for
1.Probability - will ought
2.Possibility - can, could, may, might