Mutualising is valid Scrabble Word

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

Definitions for MUTUALISING in dictionary:

Words related to MUTUALISING

mutualise11
Find what other words can be done using letters: "mutualising"
https://scrabble-word.com/finder/mutualising
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