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.
flow follow fallow fellow flew fowl filo floe flaw fillo flawy folio flooie felloe flooey fly fil flu fail foal flue fley fell full flay fool feel fuel flee fila foil file fill foul feal fall flea felly fille feyly filly fella folly folia foley fully
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