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.
puss pussy pus piss pass poussie pious passe posse pause passee psi pas pes pis pehs puce peas piso pows pees pews pose hyps pias pays poos pois pase pies peso posy paws peise psoae poise hypes paseo paisa hypos psoai pease poohs poesy paise
buss fuss cuss gauss muss puss suss wuss us