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.
cools cols coolies coles cowls coils colas coals coulis coalas coleus colies colossi collies coulees coulisse coalesce colessee coalless kohls clews calos cauls kolos goals claws clays clues class culls calls cloys kolas close colza gaols koels cullis caulis callus clause callas classy koalas caules calesa quolls callees callose callous cullays cullies goalies goalless gals guls
fools cools shools wools mools tools pools cowls fouls bowls floosy reoils knolls roles haoles foals lolls polos molas coles dols holloos cols polys toils viols kolos bolos oils polis sheols cholas wholes tolus dolls solus soils joles foils violas fowls molls diols howls noils kohls hulloos toles goals polls roils bolus aiolis soles voles mols colas koels loos boles pols solos holes jowls quolls kolas bolas bolls moils coils noels tolls moolas loose ghouls poles oles nolos boils halloos souls coals tolas moles gaols owls rolls sols doles hols cholos shoals yowls
cool coolly cooly coolie col collie cowl coulee coly colly coil cole cola coaly coala coal coyly