Unknownness is valid Scrabble Word

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

Definitions for UNKNOWNNESS in dictionary:

Words related to UNKNOWNNESS

unknown14 unknownnesses20

Words that contain UNKNOWNNESS

unknownnesses20

Similar words containing KNOWNNES without suffix s and without prefix un

unknownnesses20
Find what other words can be done using letters: "unknownness"
https://scrabble-word.com/finder/unknownness
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