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.
caseates casettes castes cassettes casts cassatas coasts cosets gaseities casitas cossets coesites gazettes costs gasts custos caestus gussets gustoes keysets quaysides gusts kists
caseates nauseates seats sautes sates leasts miseats musettes misseats beasts niceties pastes reseats societies tastes wastes bastes easts lysates fossettes feasts hastes gestes casettes cassettes castes gazettes cetes noisettes poussettes rosettes disseats testes yeasts
caseate cased casette cassata cassette caste caused