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.
galagos gulags clags glugs gallicas glaucous galax gloggs galaxy glucose colugos calicos calicoes calks colleagues clacks clocks gleeks caulks kulaks calques claques cloacas cloques
galagos lags logos flags clags colugos gulags slags