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.
pas pass peas paws pays pase pias pease passe paseo paise paisa pause pis psi pes passee pus pees posy pose puss pois piso peso pehs pows piss pacy poos pace pews pies hyps peace pious psoai hypes pacey poohs pizza poise posse hypos psoae poesy peise pussy piazza piazze