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.
curdy curd cured corody curred crowdy cruddy cred card curried corrody cord curt crud gourd caird guard crowd curet cried credo creed cared cored court grody crude curate gourde greedy quired cardia cardio curite caried corrade queried corrida carroty carried cardiae queered crowdie curette corrode querida quarried cart crit grad grid
curdy urd toured tardy turd gourde grody guard loured sciurid lured cured mured pardy perdy purda weirdy lardy nerdy surd burd curd ruddy cruddy corrody corody hardy lurid dured murid nurd parody poured purty soured gourd wordy
cur cure curia curiae curie curio curr currie curry scurry