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.
brrr brr burr birr barre burry berry burro burrow barrio borrow barrow bar bra bro bur bourree broo bury brio bura boar brie biro brae bier bare bear boor buhr braw bora brew bore beer bray brow bree byre beery brugh burgh