Inexpugnability is valid Scrabble Word

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

Definitions for INEXPUGNABILITY in dictionary:

Find what other words can be done using letters: "inexpugnability"
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