Here’s one suggested by my friend and editing colleague, Linda Bates. As a special bonus, it has a US / UK English twist. How exciting!

A kerb is a noun meaning the stone edging of a pavement or path. There are some verbs associated with kerb, notably kerb-crawling, which is driving slowly on the lookout for a prostitute.

Curb is a noun meaning a limit or control (“I’m imposing a curb on the amount of alcohol you can drink at home”) and a verb meaning to keep in control or limit (“I’m curbing the amount of alcohol you can drink at home”). A curb is also a type of bit used in a horse’s bridle.

And, excitingly, American English uses the same word (curb) for both!

You can find more troublesome pairs here and the index to them all so far is here.