Stationariness is valid Scrabble Word

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

Definitions for STATIONARINESS in dictionary:

Words related to STATIONARINESS

stationary13
Find what other words can be done using letters: "stationariness"
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