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.
caracole caracol caracal caracul coracle crackle crackly grackle curricle gargoyle gargle karakul craggily curculio gurgle
caracole rackle borecole bricole caracol coracle crackle grackle miracle oracle treacle
carack carrack crack cracky curacao curacoa