burr

noun

1
United States politician who served as vice president under Jefferson; he mortally wounded his political rival Alexander Hamilton in a duel and fled south (1756-1836)
2
small bit used in dentistry or surgery
3
rough projection left on a workpiece after drilling or cutting
4
rotary file for smoothing rough edges left on a workpiece
5
seed vessel having hooks or prickles

Also useful for “burr”:Unscrambler— Turn loose letters into real words