Deregister is valid Scrabble Word

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

Definitions for DEREGISTER in dictionary:

Words related to DEREGISTER

deregistered15 deregistering16 deregisters13
Find what other words can be done using letters: "deregister"
https://scrabble-word.com/finder/deregister
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