Curstness is valid Scrabble Word

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

Definitions for CURSTNESS in dictionary:

Words related to CURSTNESS

curstnesses13 peevishness19

Words that contain CURSTNESS

curstnesses13

Similar words containing CURSTNES without suffix s

curstnesses13
Find what other words can be done using letters: "curstness"
https://scrabble-word.com/finder/curstness
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