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.
ruckus rucks raucous rakus rocks racks recks ricks wracks wricks recuse rugous wrecks rickeys rocs rugs recs rakes reeks rooks rakis rykes rakees rekeys rogues roques rugosa rugose wreaks rookies
ruckus hecks shacks haikus necks cuss whackos pocks licks nocks docks bocks kicks hocks sicks mucous racks buckos kues becks caucus raucous jacks locus macks bucks hoicks chicks yoicks shocks chucks wicks wackos tacks dicks socks sacks pecks yacks mocks knacks tucks sucks wrecks backs recuse gucks rocks quicks fecks jocks geckos hakus hicks locks gecks rakus jukus fucks fucus ficus pucks mucks sickos kecks cues focus dioicous nicks lacks picks wacks ecus knocks hacks shackos lucks hocus hucks mucus jockos rucks quacks ricks cocks recks fucous wracks soukous ticks micks checks shucks packs wricks skuas decks ducks wackes whacks chocks shicksa yocks yucks
ruck rack reck rick rickey rock rocky cruck truck