Yes, gnaws is a Scrabble word!
...and is worth 9 points in Scrabble, and 11 points in Words with Friends
gnaws
Verb
1. Bite or chew on with the teeth
2. Become ground down or deteriorate
What Scrabble words can I make with the letters in gnaws?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words