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.
pain pin pan pein pine pian pion pawn pane pean pina piny pinna pinny panne piano piney paeon paean pawnee pinnae pun pen poon pone peon peen pony puna puny penna penne penni penny peony punny
ain fain vain cain gain kain lain main pain rain sain tain wain chain an in