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