Imperturbability is valid word

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

Definitions for IMPERTURBABILITY in dictionary:

Similar words containing PERTURBABIL without suffix ity and without prefix im

imperturbabilit23 imperturbabilities26
Find what other words can be done using letters: "imperturbability"
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