Io is valid Scrabble Word

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

Definitions for IO in dictionary:

Words related to IO

ios3

How to use IO in a sentence

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