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.
gussie gauss guise guess gussy gawsie cuisse quassia cuss guys kusso quass quasi goose cusso gauze gassy cause cosie cassia causey goosey kousso gas gos
gussie lassie poussie tassie dassie tusseh passe ossia cosie fesse fosse newsie masse issue lassi quassia gawsie cassia posse byssi cuisse reissue tissue fossae tasse sice assai size passee issei mousse jesse lessee bassi wrasse chasse