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.
curdle cradle cordelle credal curtal curtly cordial courtly crudely creedal curtail griddle quartile cordially cartel kirtle gardyloo greedily
hurdle curdle girdle chordal weirdly turtle treadle myrtle lairdly griddle raddle reddle riddle ridley ruddle bordel bridle kirtle fardel lordly hardly dartle hierodule treddle hurtle urodele cradle whortle buirdly chortle
curd curdy curt curred curette card cardia cardiae cardio cord court credo cred crud cruddy crude curate cured curet curite curried scurried