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.
broaden burden bradoon burton baryton bourdon bridoon baritone barytone brighten britannia brittania
broaden harden garden trodden warden
broad brad board braid bread bready brood broody byroad abrade abroad