Yes, scarcer is a Scrabble word!
...and is worth 11 points in Scrabble, and 13 points in Words with Friends
scarcer
Adjective
1. Deficient in quantity or number compared with the demand
What Scrabble words can I make with the letters in scarcer?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words
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Words that can be created with an extra letter added to scarcer:
K:crackers