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