Isos is valid Scrabble Word

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

Definitions for ISOS in dictionary:

Words related to ISOS

iso3
Find what other words can be done using letters: "isos"
https://scrabble-word.com/finder/isos
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