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