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.
cool cooly col coolly coolie coly coil cowl cole cola coal coaly coyly colly coala collie coulee claw kolo clay goal gaol cull caul calo call kohl clew cloy clue koel kola calla cully golly koala quoll
fool cool mool pool tool wool shool
coo cooee cooey coocoo cook cookey cookie cooky