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.
downy down towny don done town dona tony deny dawn donne toney donna donee tawny townie dinghy tawney donnee townee den din dan ton dun dyne dean dune dino dine dene toon tone tiny deni
downy towny own mown phony phoney fawny bony bonny cony boney mony pony awny tawny tony lown coney winy snowy goony sawney sonny honey gown looney loony money moony known wany lawny peony down gooney sown tawney toney town shown