Language Comparisons

English is full of word pairs that look almost identical but mean different things, and that's where most everyday writing slips up. These pages explain the rule, give a memory trick where one helps, and show worked examples so the right word is the obvious one next time.

Last reviewed on 2026-04-27.

Verbs and verb-like words

Affect vs Effect Affect is usually a verb (to influence); effect is usually a noun (the result). Lie vs Lay You lie down (no object); you lay something down (it takes an object). Immigrate vs Emigrate Immigrate means to move into a new country; emigrate means to leave one.

Comparative words

Fewer vs Less Fewer is for things you can count; less is for amounts you can't. Further vs Farther Farther is physical distance; further is figurative or means "additional." Then vs Than Then is about time or sequence; than is about comparison.

Pronouns and contractions

Its vs It's "Its" is possessive; "it's" is short for "it is" or "it has." Your vs You're "Your" is possessive; "you're" is short for "you are." Whose vs Who's "Whose" is possessive; "who's" is short for "who is" or "who has." Their vs There vs They're Their is possessive, there is location, and they're is "they are." Who vs Whom Who is the subject (it does something); whom is the object (something is done to it). To vs Too "To" introduces direction or an infinitive; "too" means "also" or "excessively."

Easily confused pairs

Compliment vs Complement A compliment is praise; a complement completes or pairs well with something. Gray vs Grey Gray is the American spelling; grey is the British spelling. Same color, same word. i.e. vs e.g. "i.e." means "that is" (clarifying); "e.g." means "for example" (illustrating). Lose vs Loose Lose is a verb (to misplace or fail to win); loose is mainly an adjective (not tight). One letter, completely different jobs. Accept vs Except Accept means to receive or agree to; except means to exclude or other than. Advice vs Advise Advice (with a C) is the noun — guidance you give. Allusion vs Illusion An allusion is an indirect reference; an illusion is a deceptive appearance or false impression. Alot vs A Lot "Alot" isn't a word. Capital vs Capitol Capital means the city or money or an uppercase letter. Cite vs Site vs Sight Cite is a verb meaning to quote or reference. Every day vs Everyday Every day (two words) means each day. Into vs In to Into (one word) is a preposition showing motion or transformation. Peak vs Peek vs Pique Peak means the top or highest point. Principal vs Principle Principal means main, or the head of a school, or the original sum of a loan. Simile vs Metaphor A simile compares using "like" or "as." A metaphor compares directly without those words. Stationary vs Stationery Stationary (with an A) means not moving.