Yes, arrant is a Scrabble word!
...and is worth 6 points in Scrabble, and 7 points in Words with Friends
arrant
Adjective
1. Without qualification; used informally as (often pejorative) intensifiers
What Scrabble words can I make with the letters in arrant?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words