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.
cossets cosets costs coasts cassettes gussets casts casettes caseates cassatas keysets coesites gaseities gasts gusts kists castes custos guests quests caestus casitas cuestas
assets knessets cossets tassets bassets russets possets missets gussets sets besets resets bassetts miseats misseats suets setts pesetas seats keysets reseats rosets disseats cosets tsetse
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