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.
cheetahs chetahs cheats sheets shittahs chuddahs chateaus chads chats chits chutes chides chotts chitties shads sheds shits shots shuts shades shoats shoots shotes shotts shouts shutes
cheetahs chetahs etas betas bettas fetas getas lotahs pietas reatas zetas shittahs tas
cheetah chaeta chaetae cheat chetah sheet