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.
pion pin poon pone pein pina peon pian pine pony piny pain paeon pinna piano piney peony pinny pinnae pun pen pan hyponea pawn hyponoia pean pane puna peen puny paean panne penna penne penni penny punny
ion lion pion cion scion in on