BIRR is a playable word

birr Scrabble® Dictionary

noun
pl. birrotch
a monetary unit of Ethiopia
verb
birred, birring, birrs
to make a whirring noise
4 Playable Words can be made from "BIRR"
   2-Letter Words (1 found)
   3-Letter Words (2 found)
   4-Letter Words (1 found)