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.
cariocas carcase carcass crocs crocks crocus cargos cricks caracks cargoes curacoas carracks carks crooks crucks cracks croquis karaokes garigues curacaos carex corks crags grogs groks grigs crakes creaks creeks croaks gregos quarks