Dunniest is valid Scrabble Word

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

Definitions for DUNNIEST in dictionary:

Words related to DUNNIEST

dunny9
Find what other words can be done using letters: "dunniest"
https://scrabble-word.com/finder/dunniest
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