Subnivean is valid Scrabble Word

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

Definitions for SUBNIVEAN in dictionary:

Words related to SUBNIVEAN

subniveal14
Find what other words can be done using letters: "subnivean"
https://scrabble-word.com/finder/subnivean
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