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.
posy poesy pose pows poos pois poise pious pussy poohs hypos posse psi pis pus pas pes poussie powwows pehs pews hyps puss pacy piso peas piss pays pies paws pass peso pase pias pees peise psoae paisa pease paseo pause paise psoai pacey hypes passe
cosy goosy nosy posy rosy choosy os