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.
glow callow gul gal gull cowl cloy glia glee gale goal kilo gley gall calo gaol kolo clew glue claw gala gluey gaily gayly gally galea galah gully guile golly
low allow shallow wallow slow plow mellow glow callow hollow hallow follow flow fellow fallow blow billow below bellow alow mallow pillow sallow tallow willow yellow lo