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.