Superiorship is valid Scrabble Word

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

Definitions for SUPERIORSHIP in dictionary:

Words related to SUPERIORSHIP

superiorships20

Words that contain SUPERIORSHIP

superiorships20
Find what other words can be done using letters: "superiorship"
https://scrabble-word.com/finder/superiorship
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