Slubbiest is valid Scrabble Word

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

Definitions for SLUBBIEST in dictionary:

Words related to SLUBBIEST

slub6 slubby13
Find what other words can be done using letters: "slubbiest"
https://scrabble-word.com/finder/slubbiest
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