Zo is valid Scrabble Word

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

Definitions for ZO in dictionary:

Words related to ZO

dzo13 dzos14 jomo13 zho15 zobo15 zobu15 zos12
Find what other words can be done using letters: "zo"
https://scrabble-word.com/finder/zo
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