Yes, sinews is a Scrabble word!
...and is worth 9 points in Scrabble, and 10 points in Words with Friends
sinews
Noun
1. A cord or band of inelastic tissue connecting a muscle with its bony attachment
2. Possessing muscular strength
What Scrabble words can I make with the letters in sinews?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words