Gentilising is valid Scrabble Word

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

Definitions for GENTILISING in dictionary:

Words related to GENTILISING

gentilise10
Find what other words can be done using letters: "gentilising"
https://scrabble-word.com/finder/gentilising
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