Postisolation is valid Scrabble Word

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

Definitions for POSTISOLATION in dictionary:

Similar words containing ISOLA without suffix tion and without prefix post

isolate7 isolable10 isolated9 isolates8 isolator8 antisolar9 isolating10 isolation9 isolative12 isolators9 lunisolar9 isolatable12 isolations10 isolability16 isolationism14 isolationist12 isolabilities15 isolationisms15 isolationists13
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