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.
colugos cologs glugs clogs clags collogues colics clucks colloquies colleagues cliques claques cloques calques galagos glaucous cowlicks calks clacks gloggs cleeks clocks caulks cloaks clicks gulags kolkoz calicos cloacas glucose kolkozy
colugos lugs logos belugas galagos glugs plugs slugs