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.
colossi cols coals coles cloys coulisse close coils cowls colessee kolos coalless gloss colas class cools calos coalas coleus glossy colies coulis classy glossa glassie callous callose collies glossae coolies coulees goalless coalesce claws kohls goals clews gaols clues colza koels cauls calls glass cloze kolas clays culls glows kilos cullis clause calesa callas koalas glassy caulis caules callus quolls callees cullays cullies gallous gallows goalies keyless
colossi loss lassi loess lossy floss flossie flossy gloss glossa glossy