Sinkerball is valid Scrabble Word

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

Definitions for SINKERBALL in dictionary:

Words that contain SINKERBALL

sinkerballs17
Find what other words can be done using letters: "sinkerball"
https://scrabble-word.com/finder/sinkerball
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