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.
deafens defense deafness davens defence defines deveins daffiness dovens divans devons daphnias dauphins defiance deviance deviancy diaphanous daphnes divines tiffins
deafens fens faenas avens havens heavens caffeins leavens mavens offense ravens davens defense