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.
coos cos cooeys cooees coys goos cows cosy coss cosie cosey goosy goose goosey kos gos coz casa koas goys cues cuss kois goas goes case cays cozy caws koss cause cozey cozie cusso gazoo kazoo
boos coos goos loos moos poos zoos woos shoos os
coo cooee cooey coocoo cook cookey cookie cooky