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.
crackle coracle crackly grackle caracole caracal caracol caracul creakily croakily curricle karakul craggily curculio gargle gurgle
crackle rackle grackle ruckle brickle freckle caracole coracle crackly miracle oracle prickle darkle treacle trickle truckle
crack cracky carack crake creak creaky crick crickey croak croaky crock cruck curacao curacoa