Syntexises is valid Scrabble Word

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

Definitions for SYNTEXISES in dictionary:

Words related to SYNTEXISES

syntexis18
Find what other words can be done using letters: "syntexises"
https://scrabble-word.com/finder/syntexises
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