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.
caestus casts coasts casitas cuestas costs gasts coesites cassatas custos guests castes quests keysets caseates casettes cassettes gusts kists cosets cossets
caestus cestus beasts guests feists gests hygieists acetous geests easts besets leasts rests bests resets cestas pistous situs setous siestas zests testes tests chests besots quests hests nests pestos feasts cuestas jests gestes hygeists heists cestos vestas vests fiestas fests resits reests wrests pests cistus xystus deists testis wests yeasts
cast casette casita caste coast cuesta