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.
cassettes casettes caseates castes cossets cassatas gazettes gaseities cosets gussets coesites casts coasts caestus casitas gustoes keysets quaysides costs gasts
casettes fossettes cassettes musettes noisettes poussettes rosettes setts settees bassetts caseates gazettes nauseates sets
cassette caseate casette cassata cosset cast