Impostumed is valid Scrabble Word

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

Definitions for IMPOSTUMED in dictionary:

Similar words containing POSTUM without suffix ed and without prefix im

impostume15 impostumes16 impostumate17 impostumated19 impostumates18 impostumating20 impostumation19 impostumations20
Find what other words can be done using letters: "impostumed"
https://scrabble-word.com/finder/impostumed
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