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.
guerdon gueridon guardian cardon garden cordon gradin cardoon grutten gardenia gratin craton carton croton carotin cartoon crouton curtain greaten keratin quartan
guerdon radon redon redone bourdon fordone foredone verdin cardon cardoon cordon gueridon lardon lardoon pardon teardown