What are the 10 most commonly misused words?

10 Words Even Smart People Mix Up

Let’s be honest—we’ve all sent that email or text and only spotted the mistake after hitting send. The tricky thing about the English language isn’t just its rules, but the words that look or sound alike yet carry entirely different meanings. Spell check won’t always save you, so training your eye to spot these mix-ups is half the battle.

Take its vs. it’s. That tiny apostrophe makes all the difference. “It’s” is a contraction for “it is” or “it has,” while “its” shows possession—like “The dog wagged its tail.” Mess this up, and your sentence crumbles.

Then there’s their, there, they’re. They’re (see what we did there?) easy to confuse. “Their” shows ownership, “there” refers to a place, and “they’re”? That’s just “they are.” Simple, but often misused in casual writing.

You’ve probably tangled with affect and effect, too. Generally, “affect” is a verb (to influence), and “effect” is a noun (the result). Though yes, “affect” can also be a noun in psychology—like emotional affect—but that’s a niche case.

Don’t forget compliment (a nice thing you say) vs. complement (something that completes). A great wine complements cheese, but you might compliment the chef.

And while we’re at it: except (excluding) vs. accept (to receive), insure (often financial protection) vs. ensure (to make certain), and are vs. our—which are homophones but wildly different in use.

These slips happen to everyone. But catching them? That’s what makes your writing crisp, clear, and confident.