Diarch is valid Scrabble Word

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

Definitions for DIARCH in dictionary:

Words that contain DIARCH

diarchy16 diarchal14 diarchic16 diarchies15 diarchical18
Find what other words can be done using letters: "diarch"
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