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.
caput coapt kaput capita capote copout kaputt caped coopt capped cowpat kept
kaput caput put apt wrapt teapot repute depute sputa spout copout rapt kaputt coapt putt pout deputy leapt chapt