Pessimum is valid Scrabble Word

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

Definitions for PESSIMUM in dictionary:

Words related to PESSIMUM

pessima11 pessimal12
Find what other words can be done using letters: "pessimum"
https://scrabble-word.com/finder/pessimum
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