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.
poohs poos pois posy powwows pehs pose pows posse pious poise poesy hypos pas pus pes poussie psi pis pews peas hyps peso paws pass piss pias pays pees pies piso pase puss
oohs poohs ohs choosy woos boos coos goos goose goosy loos loose noose poos roose zoos moos choose moose shoos