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.
cardioid carotid carded carted corded credit curded guarded cordite crowded crawdad crudity crudded corraded corroded keratoid crawdaddy crated graded grided
cardia cardiae cardio card caird cared caried carried acarid