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.
colas coalas cols class coils coals claws kolas coles cowls colza clays cools coleus coulis clause classy colies callas koalas cullays coolies coulees collies colossi coulisse coalless coalesce colessee kolos kohls cauls koels glass glias clews cloys clues gaols culls close goals calos calls galas galahs caules galeas caulis cullis callus quolls calesa glassy glassie callous cullies callees goalies queleas callose galleass galliass goalless quillais gals guls quillaias
violas moolas bolas colas cholas molas tolas kolas las hylas kohls class boils galahs quillais alias voles coils colza lase moolahs galeas mullas glass bowls blaws aiolis fowls coles belays lays hilloas cowls fools allays blase doulas moils joles kolos zillahs boles koalas moles bolls palais foils paellas reoils dolls flaws tools pools wallas roles solus chalahs wholes challas oils soils cholos talas sheols shools diols tolls lolls mullahs foals solos polls scillas alas slaws fleas glias poles ollas pilaus nolos dalasi blahs coals noels fellas noils queleas hulloas oles howls balas hulas toils clays doles cullays fellahs fouls quolls polos cools pilaws knolls flays bolus owls mollahs hallahs galas cols hols bolos holloas haoles chelas plays boylas hollas claws villas molls leas bylaws dols pols mools mols halloas nalas polis laws coalas gaols challahs jowls soles callas holes nullahs viols dahlias goals koels lass ghouls selahs pleas souls relays delays sols polys rolls tolus dulias wallahs roils waylays slays wools chollas toles sheilas shoals yowls
cola col kola cowl cooly coolly coolie cool coly colly cole collie coil coaly coala coal clay claw coulee coyly coagula