Unstifled is valid Scrabble Word

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

Definitions for UNSTIFLED in dictionary:

Similar words containing STIFL without suffix ed and without prefix un

stifle9 stifled11 stifler10 stifles10 stiflers11 stifling12 stiflings13 stiflingly17
Find what other words can be done using letters: "unstifled"
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