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.
possets posts poussettes posits pesetas pasts passades pests pussytoes passadoes pseuds posties posadas piosities pistes pastas pastes pastis pestos pasties pesades pistous pseudos
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
posset passed pissed poised posed poussette