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.
pawn pan pawnee pean pian pane pain paeon piano paean panne pun pin pen peen pine pion pony pein piny pina pone peon puna poon puny penna penne penni penny peony piney pinna pinny punny
awn fawn lawn mawn gnawn pawn sawn dawn shawn yawn an