Muckinesses is valid Scrabble Word

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

Definitions for MUCKINESSES in dictionary:

Words related to MUCKINESSES

muckiness17
Find what other words can be done using letters: "muckinesses"
https://scrabble-word.com/finder/muckinesses
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