Yes, birr is a Scrabble word!
...and is worth 6 points in Scrabble, and 7 points in Words with Friends
birr
Verb
1. Make a soft swishing sound
Noun
1. The basic unit of money in Ethiopia; equal to 100 cents
2. Sound of something in rapid motion
What Scrabble words can I make with the letters in birr?
3 Letter Words
2 Letter Words