Yes, casques is a Scrabble word!
...and is worth 18 points in Scrabble, and 20 points in Words with Friends
casques
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 casques?
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1 Anagram of Casques
Words that can be created with an extra letter added to casques:
T:acquests