Nubber is valid Scrabble Word

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

Definitions for NUBBER in dictionary:

Words related to NUBBER

nubbers11
Find what other words can be done using letters: "nubber"
https://scrabble-word.com/finder/nubber
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