Erk is valid Scrabble Word

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

Definitions for ERK in dictionary:

Words related to ERK

erks8
Find what other words can be done using letters: "erk"
https://scrabble-word.com/finder/erk
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