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.
crackly crackle creakily croakily caracal caracol caracul coracle grackle caracole craggily karakul curculio curricle quirkily
crackly rackle freakily freckly crackle creakily croakily grackle prickly darkly treacly trickily trickly
crack cracky carack crake creak creaky crick crickey croak croaky crock cruck curacao curacoa