Yes, arista is a Scrabble word!
...and is worth 6 points in Scrabble, and 6 points in Words with Friends
arista
Noun
1. Bristlelike process near the tip of the antenna of certain flies
What Scrabble words can I make with the letters in arista?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words