Knockback is valid Scrabble Word

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

Definitions for KNOCKBACK in dictionary:

Words related to KNOCKBACK

knockbacks28

Words that contain KNOCKBACK

knockbacks28
Find what other words can be done using letters: "knockback"
https://scrabble-word.com/finder/knockback
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