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.
paeon peon peony paean pan pen pane pion pian pawn poon pein pony pone peen pain pean panne penny penne penni piano pennae pawnee pinnae hyponea pin pun hyponoia pina pine piny puna puny
paeon aeon eon faena haen jeon gaen kaon leone neon paean peon peony tauon hyaena