Subitizing is valid Scrabble Word

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

Definitions for SUBITIZING in dictionary:

Words related to SUBITIZING

subitize19
Find what other words can be done using letters: "subitizing"
https://scrabble-word.com/finder/subitizing
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