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.
nicols nickles nickels nickelous niggles nucleus knuckles neckless nuclease knockless necklace
cols nicols guaiacols googols skoals cyclos rugolas recoals vocals gigolos colas gaols coles cools locals vacuoles sokols ticals coils koels cowls recoils piculs socles scowls kolos cycles kolas quolls jacals decals kohls goals macles coals faucals boucles chicles
nicol nickel nickle uncoil uncool