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.
grisly grizzly grossly grassily greasily grisaille curiously crossly crassly crusily crissal grizzle crazily gracile coarsely crousely cresol cresyl creosol carousal carousel
grisly hoarsely drowsily seriously prosily pricily parsley grossly greasily curiously crousely crossly crazily crassly coarsely horsily racily rosily furiously frowzily frizzily erosely breezily brassily crusily grassily variously morosely porously prissily pursily dressily tersely
cris crissa gars gorse gorsy grass grassy gross kris agrias