I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
detainees detains detinues deadness tetanies dottiness tattiness dittanies dedans deadens tetanus doughtiness tetanise tautness tidiness tetanize duotones titaness dowdiness titans dudeens tautens titanias titanous teutonize
detainees betaines matinees patines ratines