ARBITER is a playable word

arbiter Scrabble® Dictionary

noun
pl. arbiters
one chosen or appointed to judge a disputed issue
(adjective) arbitral
98 Playable Words can be made from "ARBITER"
   2-Letter Words (15 found)
   3-Letter Words (31 found)
   6-Letter Words (8 found)
   7-Letter Words (2 found)