Seasickest is valid Scrabble Word

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

Definitions for SEASICKEST in dictionary:

Words related to SEASICKEST

seasick13
Find what other words can be done using letters: "seasickest"
https://scrabble-word.com/finder/seasickest
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