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.
pein pen pin pina peen piny pean peon pian pain pion pine piney peony pinna penni pinny penna paeon penny paean piano penne pennae pennia pinnae pun pan pane pawn pone pony poon puna puny panne punny