Interpenetrations is valid word

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

Definitions for INTERPENETRATIONS in dictionary:

Similar words containing TERPENETRATION without suffix s and without prefix in

interpenetration18
Find what other words can be done using letters: "interpenetrations"
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