Gub is valid Scrabble Word

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

Definitions for GUB in dictionary:

Words related to GUB

gubbah14 gubbed12 gubbing13 gubs7
Find what other words can be done using letters: "gub"
https://scrabble-word.com/finder/gub
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