Slumberousness is valid Scrabble Word

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

Definitions for SLUMBEROUSNESS in dictionary:

Words related to SLUMBEROUSNESS

slumberous14
Find what other words can be done using letters: "slumberousness"
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