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