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.
brig brag burg berg brick boric baric bourg bricky burgoo braggy brogue birkie brookie berk bark birk bork barca barky brake braky break brock broke brook burka burke burqa
rig brig frig grig prig rerig trig