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.
caudad caudate caddied cadet coded catted coated codded guided quadded quiddity
aoudad audad caudad dad dada dado dead duad duddy feuded hodad lauded mediad doodad duded
cad cud scudi scud scad gaudy gaud cued cuddie cuddy coude caid cadi cade caddy caddie scudo