Is “Nincompoop” a Scrabble word?
Yes
NINCOMPOOP
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Nincompoop
/ˈnɪŋkəmpuːp/
noun
1.A foolish or silly person.
Synonyms: dunderhead, fool, imbecile, nitwit