Superefficiencies is valid Words with Friends

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

Definitions for SUPEREFFICIENCIES in dictionary:

Similar words containing EFFICIENCIE without suffix s and without prefix super

efficiencies22 inefficiencies24
Find what other words can be done using letters: "superefficiencies"
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