Mimsy is valid Scrabble Word

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

Definitions for MIMSY in dictionary:

Words related to MIMSY

mimsey13 mimsier11 mimsiest12
Find what other words can be done using letters: "mimsy"
https://scrabble-word.com/finder/mimsy
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