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