Underworker is valid Scrabble Word

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

Definitions for UNDERWORKER in dictionary:

Words related to UNDERWORKER

underworkers20
Find what other words can be done using letters: "underworker"
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