Underestimations is valid word

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

Definitions for UNDERESTIMATIONS in dictionary:

Similar words containing DERESTIMATION without suffix s and without prefix un

underestimation18
Find what other words can be done using letters: "underestimations"
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