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.
classed glassed closed glossed clast coleseed callused calloused coalesced closet glazed glaceed calceate closeout gallused glissade glozed calcite coolest culicid
glassed classed lased lassoed leased liaised blessed blissed flossed glossed pleased released
class classy clause claws clays colas glass glassie glassy