Duper is valid Scrabble Word

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

Definitions for DUPER in dictionary:

Words related to DUPER

dupe7 dupers9
Find what other words can be done using letters: "duper"
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