Coursebook is valid Scrabble Word

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

Definitions for COURSEBOOK in dictionary:

Words related to COURSEBOOK

coursebooks19

Words that contain COURSEBOOK

coursebooks19
Find what other words can be done using letters: "coursebook"
https://scrabble-word.com/finder/coursebook
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