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.
cobbs cobs cobias cabs cabbies kobs cowboys gobs cubs cubbies cubes kobos gobos gobies goboes kibbes kibbis caboose kebbies kibbehs gabs kabs
cobbs ebbs lobos kobs gobs kibbis jobs jibbs cobs hobos hobs fobs robes rabbis sibbs obes sobs nobs yobbos mobs bubs abbas bibs knobs lobs lobes kibbes kobos abbes bibbs gobos bubbas bobs boobs robs rebbes sobas obis tabbis obas yobs
cobb cobby cob cabbie cabby cobia cowboy cubby