Cumulostrati is valid Scrabble Word

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

Definitions for CUMULOSTRATI in dictionary:

Words related to CUMULOSTRATI

cumulostratus17
Find what other words can be done using letters: "cumulostrati"
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