Yes, scalar is a Scrabble word!
...and is worth 8 points in Scrabble, and 10 points in Words with Friends
scalar
Adjective
1. Of or relating to a musical scale
2. Of or relating to a directionless magnitude (such as mass or speed etc.) that is completely specified by its magnitude
Noun
1. A variable quantity that cannot be resolved into components
What Scrabble words can I make with the letters in scalar?
6 Letter Words
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3 Letter Words
2 Letter Words