Flatnesses is valid Scrabble Word

Is flatnesses a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is flatnesses valid Words with Friends?
Words with Friends YES

Definitions for FLATNESSES in dictionary:

Words related to FLATNESSES

flat7 flatness11
Find what other words can be done using letters: "flatnesses"
https://scrabble-word.com/finder/flatnesses
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