Counterproof is valid Scrabble Word

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

Definitions for COUNTERPROOF in dictionary:

Words related to COUNTERPROOF

counterproofs20

Words that contain COUNTERPROOF

counterproofs20
Find what other words can be done using letters: "counterproof"
https://scrabble-word.com/finder/counterproof
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