Protoceratopses is valid Scrabble Word

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

Definitions for PROTOCERATOPSES in dictionary:

Find what other words can be done using letters: "protoceratopses"
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