Common Confusions & Confusable Words
Here's the thing — most of these never make it as far as real grammar. They're just lookalike words that keep swapping places, usually in the email you fire off at 4:55 on a Friday. Spot the swap and you're done. One clean tell each, then a door through to the article that actually teaches it.
| Pair | The quick tell | Learn it here |
|---|---|---|
| affect / effect | Affect is the verb (to influence); effect is the noun (the result). | P8 · Word choice & confusables |
| its / it's | Its = belonging to it; it's = it is or it has. | P2 · Pronouns & possessives |
| their / there / they're | Their = belonging to them; there = a place; they're = they are. | P2 · Pronouns |
| your / you're | Your = belonging to you; you're = you are. | P2 · Pronouns & contractions |
| who / whom | Who does the action (subject); whom receives it (object) — swap in he/him to test. | P2 · Pronouns |
| fewer / less | Fewer for things you can count one by one; less for a mass you can't. | P5 · Agreement & concord |
| then / than | Then = time or what happens next; than = a comparison. | P8 · Word choice & confusables |
| accept / except | Accept = to receive or agree to; except = apart from. | P8 · Word choice & confusables |
| principle / principal | Principle = a rule or belief; principal = main, or the head of a school. | P8 · Word choice & confusables |
| complement / compliment | A complement completes something; a compliment praises it. | P8 · Word choice & confusables |
| practice / practise | Practice = the noun; practise = the verb (UK — see note below). | P8 · Word choice & confusables |
| advice / advise | Advice (with a c) = the noun; advise (with an s) = the verb. | P8 · Word choice & confusables |
| to / too / two | To = direction or a verb marker; too = also / excessively; two = the number 2. | P8 · Word choice & confusables |
| lose / loose | Lose = to misplace or not win; loose = not tight. | P8 · Word choice & confusables |
| allusion / illusion | An allusion is an indirect reference; an illusion deceives the senses. | P8 · Word choice & confusables |
| stationary / stationery | Stationary (with an a) = not moving; stationery (with an e) = paper and pens. | P8 · Word choice & confusables |
| phrase / clause | A clause has a subject and a verb; a phrase doesn't. | P3 · Sentence structure & syntax |
A quick UK / US note
Only one pair here is genuinely dialectal in the mix-up itself:
| UK | US | |
|---|---|---|
| practice / practise | practice = noun, practise = verb (rule) | practice = both noun and verb (variant) |
Everywhere else above, the same trap catches writers on both sides of the Atlantic — the quick tell holds regardless. For the fuller spelling and vocabulary picture, see the Master UK/US Index.
Related in the library
- Glossary — look up any label you hit here
- P2 · Parts of Speech — its/it's, who/whom, pronouns, possessives
- P3 · Sentence Structure & Syntax — phrases vs clauses
- P5 · Agreement & Concord — number, countable vs uncountable
- P8 · Spelling, Morphology & Word Choice — the confusables home
- P10 · Common Errors & Usage Problems — the full confusables clinic
- Master UK/US Index — the complete dialect map
Hit a pair that isn't here? Head to P10 — it'll almost certainly be waiting for you.