Mixednesses is valid Scrabble Word

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

Definitions for MIXEDNESSES in dictionary:

Words related to MIXEDNESSES

mixedness19
Find what other words can be done using letters: "mixednesses"
https://scrabble-word.com/finder/mixednesses
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