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.
cowls cols colas coils cools coles coals colies coulis coleus coalas collies coulees colossi coolies colessee coulisse coalless coalesce kohls clues cauls gaols kolos class clews colza goals claws cloys culls close clays kolas calos calls glows koels classy callus clause caules callas caulis koalas calesa cullis quolls callose callous cullays cullies gallows goalies callees goalless gals guls
bowls howls owls yowls fowls jowls cowls shools foals molls belows hollows noils knolls lowse fools mewls kolas fallows oles boles bolls moles mools sallows aiolis polos blowsy voles polys haoles yellows pawls moolas colas sheols hols shallows cholas willows wawls tools tolls tolas tallows dolls solos diols fellows roles soils bolas mellows reoils oils kolos polis bawls goals bolus solus bolos molas blows joles gallows holes pols coals kohls polls noels rolls koels plows roils ghouls allows cools fouls hallows awls violas lows coles follows cols boils nolos gaols coils flows lolls billows sols foils bellows poles viols mallows pools glows moils slows mols quolls souls soles doles dols toils toles tolus wallows wholes wools cholos shawls shoals yawls pillows
cowl col coyly coal coala coaly coil cola cole colly collie coly cool coolie coolly cooly coulee scowl