Crustal is valid Scrabble Word

Is crustal a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is crustal valid Words with Friends?
Words with Friends YES

Definitions for CRUSTAL in dictionary:

How to use CRUSTAL in a sentence

Find what other words can be done using letters: "crustal"
https://scrabble-word.com/finder/crustal
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