Yes, arbiter is a Scrabble word!
...and is worth 9 points in Scrabble, and 10 points in Words with Friends
arbiter
Noun
1. Someone with the power to settle matters at will
2. Someone chosen to judge and decide a disputed issue
What Scrabble words can I make with the letters in arbiter?
7 Letter Words
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words