Cryptosystem is valid Scrabble Word

Is cryptosystem a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words NO
Is cryptosystem valid Words with Friends?
Words with Friends NO

Definitions for CRYPTOSYSTEM in dictionary:

Words that contain CRYPTOSYSTEM

cryptosystems25
Find what other words can be done using letters: "cryptosystem"
https://scrabble-word.com/finder/cryptosystem
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