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.
colure colour clour color collar cooler coiler coaler collier couloir coalier calorie collyria colliery clary clear glare gluer caller calory culler galere galore gaoler glaire gluier
allure soilure failure lure colure velure lire flour flare galore slur gluer laurae bluer velour dolour blur lour valour clour colour lore galere lyre glare fluor pleurae blare valuer tailleur
col collie coyly coulee cooly coolly coolie cool coly colly cole clue cola coil coaly coala coal cowl coquille