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.
brugh burgh bureau bur brr bar bra bro buhr brae bura braw bore bree brrr broo brio bury boor bray brie brow bare burr bear bora beer boar bier biro brew birr byre