ROBBER is a playable word

robber Scrabble® Dictionary

noun
pl. robbers
one that robs
21 Playable Words can be made from "ROBBER"
   2-Letter Words (6 found)
   3-Letter Words (11 found)
   4-Letter Words (2 found)
   5-Letter Words (1 found)
   6-Letter Words (1 found)