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.
hypos hyps hypes pose pows pois poos posy posse poohs poise pious poesy powwows pus poussie pis psi pas pes pays paws peso pies pass pias piso piss pews pees pase pehs peas puss
hypos hypes hyps pois poos pose posy pows yous yows