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.
crassly crossly grassily crazily grossly crusily crissal crousely coarsely greasily curiously cresyl grisly cresol creosol coryzal carousal carousel carrousel carcel gracile grizzly
crassly rassle wrassle brassily crossly grassily greasily grossly prissily dressily
crass carassow craws crease creasy cress cressy crissa cross crosse curassow grass grassy