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.
crosshead crossed grossed caroused crosstie caressed cursed cuirassed crusado cresset cruised groused coursed grassed creased crusade creosote cruset corset crista crazed cristae coerced greased cruzado cariosity curiosity crest crust curst