Curiousest is valid Scrabble Word

Is curiousest a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is curiousest valid Words with Friends?
Words with Friends YES

Definitions for CURIOUSEST in dictionary:

Words related to CURIOUSEST

curious9 curiouser11
Find what other words can be done using letters: "curiousest"
https://scrabble-word.com/finder/curiousest
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