Per is valid Scrabble Word

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

Definitions for PER in dictionary:

How to use PER in a sentence

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