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.
cracker croaker creakier croakier crockery corker corkier crooker caracara craggier crookery quirkier
barracker racker cracker tracker brakier trucker creakier trickery prickier wrecker freakier parker brickier larker breaker croakier raker wreaker rocker croaker crockery marker pricker darker rockier phreaker tricker barker trickier rockery sharker
crack cracky carack crake creak creaky crick crickey croak croaky crock cruck curacao curacoa