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.
raucous rugous ruckus rakus racks rucks recuse wracks rugose recs rugs rags rocs roux recks rocks ragas rakis ricks raggs rooks rakes rogues roques rakees wreaks wrecks wricks raggees raggies reggaes rickeys rookies
mucous fucous raucous soukous rugous nocuous mucus mucose mucosa guacos jucos caucus vacuous fucus fucose buckos aqueous ruckus scouse dioicous cos