Mumblecore is valid Scrabble Word

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

Definitions for MUMBLECORE in dictionary:

Words that contain MUMBLECORE

mumblecores19
Find what other words can be done using letters: "mumblecore"
https://scrabble-word.com/finder/mumblecore
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