Underdiagnoses is valid Scrabble Word

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

Definitions for UNDERDIAGNOSES in dictionary:

Similar words containing DERDIAGNOSE without suffix s and without prefix un

underdiagnose16 underdiagnosed18
Find what other words can be done using letters: "underdiagnoses"
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