Griper is valid Scrabble Word

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

Definitions for GRIPER in dictionary:

Words related to GRIPER

gripe8 gripers10
Find what other words can be done using letters: "griper"
https://scrabble-word.com/finder/griper
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