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.
clod cloud cloddy cloudy cold clot clad colloid clout cauld could yclad clued clade coled cloot colead coaled called keloid clotty culled cooled coiled cowled culotte collide collied calotte cullied collude glad colt cult gold claddagh gled glide culti gloat culet gleed glede glady glade cleat guild glued glout