Unruffable is valid Scrabble Word

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

Definitions for UNRUFFABLE in dictionary:

Words related to UNRUFFABLE

imperturbable21
Find what other words can be done using letters: "unruffable"
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