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.
gucks quacks quicks guacos cuckoos guaiacs quickies gooks gawks cocks cooks kicks cukes gowks cokes kagus kecks cakes caucus quakes cookeys cookies gawkies quokkas cogs gags kegs
bucks chucks gucks rucks pucks hucks sucks mucks yucks shucks lucks fucks ducks tucks recks ricks gecks rocks wricks buckos hocks fucus wracks kicks kecks souks cocks knocks jocks nicks jacks knacks necks docks chocks becks ukes micks yoicks yeuks pukes bocks shicksa shackos checks whacks wauks wackos quicks jauks dukes socks ruckus ticks zouks auks licks jukus lacks sicks hoicks dicks wackes sickos hacks racks hicks jukes pecks decks backs macks mocks jucos jockos cukes jouks quacks fecks sacks mucus shocks hecks locks suks caucus wrecks picks pocks neuks nukes packs tacks yucas wacks whackos wicks chicks nocks geckos shacks yacks yocks yuks