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