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