Superset is valid Scrabble Word

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

Definitions for SUPERSET in dictionary:

Words related to SUPERSET

supersets11

Words that contain SUPERSET

supersets11
Find what other words can be done using letters: "superset"
https://scrabble-word.com/finder/superset
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