Superhardening is valid Scrabble Word

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

Definitions for SUPERHARDENING in dictionary:

Words related to SUPERHARDENING

superharden17
Find what other words can be done using letters: "superhardening"
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