Ytterbous is valid Scrabble Word

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

Definitions for YTTERBOUS in dictionary:

Words related to YTTERBOUS

ytterbium16
Find what other words can be done using letters: "ytterbous"
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