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.
sarcous sargos sarks cercus circus seracs sorgos circusy sargasso
sarcous raucous arcus verrucous crocus narcos narcose percuss cercus circus circusy drouks touracos turacos turacous