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