Deregistering is valid Scrabble Word

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

Definitions for DEREGISTERING in dictionary:

Words related to DEREGISTERING

deregister12
Find what other words can be done using letters: "deregistering"
https://scrabble-word.com/finder/deregistering
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