Contravallation is valid Scrabble Word

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

Definitions for CONTRAVALLATION in dictionary:

How to use CONTRAVALLATION in a sentence

Find what other words can be done using letters: "contravallation"
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