How is valid Scrabble Word

Is how a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is how valid Words with Friends?
Words with Friends YES

Definitions for HOW in dictionary:

Words related to HOW

hows10

How to use HOW in a sentence

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