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.
clause colas claws class close cauls clays clues caules caulis coleus callus coalas classy callas glassie callose cullays callous cols colessee coalesce coulisse glaze culls cloze clews coles galas cowls coals cools glace colza coils kolas glias glues calos cloys calls glass calesa colies koalas galahs cullis galeas coulis gallus glassy queleas collies colossi coolies coulees callees glossae cullies gallous coalless galleass galliass quillais
clause valse wauls dulse sauls release please palliasse miauls mauls malaise cauls jalousie hauls false lase blouse blase luaus louse liaise lease paillasse pilaus pulse rouleaus delouse talus shauls