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.
craggy crag croaky groggy creaky cracky crack cargo corky crake croak creak carack crikey carioca carrack crickey curacao curacoa
raggy braggy craggy draggy ragg froggy groggy dreggy druggy