Improvableness is valid Scrabble Word

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

Definitions for IMPROVABLENESS in dictionary:

Similar words containing PROVABLENES without suffix s and without prefix im

provableness19 provablenesses21
Find what other words can be done using letters: "improvableness"
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