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.
peony pony peon penny paeon pen piny pone pein puny peen pean pion poon penni punny piney penne pinny penna paean pennae pennia hyponea pan pin pun hyponoia pain pane pawn pian pina pine puna
peony eon bony bonny boney goony looney meany aeon money peon paeon fenny penny pony deny teeny tony weeny sheeney moony phoney neon leone phony honey jenny jeon coney cony veiny gooney loony meiny mony benny sonny downy toney towny wenny sheeny