Zos is valid Scrabble Word

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

Definitions for ZOS in dictionary:

Words related to ZOS

zo11
Find what other words can be done using letters: "zos"
https://scrabble-word.com/finder/zos
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