Ancient Greek had two (*) different types of accent on long vowels: the "circumflex" accent indicates high tone on the first mora, and the "acute" accent indicates high tone on the second. (Short vowels only have one mora, so they don't have this distinction.)
Are there any words that are distinguished solely by these two accents? In other words, is there a valid, attested Greek word, that changes into a different valid, attested Greek word, if an acute is swapped out for a circumflex (or vice versa)?
(*) I'm ignoring the grave, since to my understanding it indicates the lack of an accent, not the presence of one. It's also a predictable "allophone" (allotone?) of the acute.