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.
caudal caudally caudle caudillo catalo cuddle cuddly cadelle gaudily cattail cattalo coattail cattle coddle coital cutely cuttle cattily cuittle coitally
feudal caudal dal tidal daedal ritual radial pedal nidal modal dahl dale deal dial dual audial hadal mutual geoidal nodal caudle pedalo loudly redial medal zooidal medial dedal ideal hyoidal
cad cud scudi scud scad gaudy gaud cued cuddie cuddy coude caid cadi cade caddy caddie scudo