Nivation is valid Scrabble Word

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

8 letters word
11 points in Scrabble
14 points in WWF

Definitions for NIVATION in dictionary:

NOUN:

weathering of rock when snow alternately freezes and thaws
erosion of the ground beneath and at the sides of a snow bank, mainly as a result of alternate freezing and thawing.
weathering of rock around a patch of snow by alternate freezing and thawing

Words related to NIVATION

nivations12

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