Yes, casque is a Scrabble word!
...and is worth 17 points in Scrabble, and 19 points in Words with Friends
casque
Noun
1. (15-16th century) any armor for the head; usually ornate without a visor
What Scrabble words can I make with the letters in casque?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words