RIBBER is a playable word

ribber Scrabble® Dictionary

noun
pl. ribbers
one that ribs
20 Playable Words can be made from "RIBBER"
   2-Letter Words (4 found)
   3-Letter Words (8 found)
   4-Letter Words (4 found)
   5-Letter Words (2 found)
   6-Letter Words (2 found)