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.
knuckle knuckly nickle nuclei nickel nicol niggle
buckle huckle chuckle muckle ruckle knuckle suckle cackle mackle fickle tackle knuckly nickle heckle rackle cockle keckle boucle pickle sickle hackle deckle mickle tickle nuclei shackle