Is “Narthex” a Scrabble word?
Yes
NARTHEX
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 Narthex
/ˈnɑːθɛks/
noun
1.A western vestibule leading to the nave in some Christian churches.