Sullennesses is valid Scrabble Word

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

Definitions for SULLENNESSES in dictionary:

Words related to SULLENNESSES

sullenness10
Find what other words can be done using letters: "sullennesses"
https://scrabble-word.com/finder/sullennesses
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