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.
cradle curdle cordelle credal curtal crudely gradual curtail griddle creedal cordial cordially gradually cartel curtly kirtle courtly greatly gardyloo greedily quartile
treadle cradle treddle griddle curdle girdle hurdle hierodule bridle broadly ruddle ridley riddle reddle radiale raddle urodele
carat create grad curd curate crude cruddy crud credo cred crate carate cord cardio cardiae cardia card curdy grade