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.
nickel nickle nicol knuckle knuckly niggle niggly
nickel deckel hackle heckle huckle jackal cackle cockle hackly likely keckle knuckle vakeel packly rackle koel tackle chuckle shekel mickle sickle keel nickle skell fickly suckle sickly ruckle pickle fickle knuckly muckle mackle quickly akela buckle feckly deckle tickle shackle yokel