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.
puna pun puny pina penna punny pinna pennae pinnae pennia pin pan pen hyponea pain pine pony pein pawn hyponoia peen pian poon pone pane piny peon pion pean paean peony panne penne penni penny paeon piano piney pinny
buna fauna kuna luna puna sauna tuna na un