Existentialistic is valid word

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

Definitions for EXISTENTIALISTIC in dictionary:

Words that contain EXISTENTIALISTIC

existentialistically32
Find what other words can be done using letters: "existentialistic"
https://scrabble-word.com/finder/existentialistic
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