Is “Antechamber” a Scrabble word?
Yes
ANTECHAMBER
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 Antechamber
/ˈæntiˌt͡ʃeɪmbə/
noun
1.A small room used as an entryway or reception area to a larger room.
Synonyms: anteroom