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.
gracioso grazioso gracious graces griseous curacies graecize grosz grazes groszy crasis grosze coriaceous grosses grouses grasses crazies grecize greases carassows curassows crases crazes crises crisis crozes cruces gorses krises
gracioso ariosos ferocious veracious voracious gracious grazioso precious