Pluto is valid Scrabble Word

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

Definitions for PLUTO in dictionary:

Words related to PLUTO

plutos8 plutoed10 plutoes9 plutoing11
Find what other words can be done using letters: "pluto"
https://scrabble-word.com/finder/pluto
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