Underdiagnosing is valid Scrabble Word

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

Definitions for UNDERDIAGNOSING in dictionary:

Similar words containing DERDIAGNOS without suffix ing and without prefix un

underdiagnose16 underdiagnosed18 underdiagnoses17 underdiagnosis17
Find what other words can be done using letters: "underdiagnosing"
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