Triffest is valid Scrabble Word

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

Definitions for TRIFFEST in dictionary:

Words related to TRIFFEST

triff11
Find what other words can be done using letters: "triffest"
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