cenacle vs parlor

cenacle

noun
  • A dining room, especially one on an upper floor (traditionally the room in which the Last Supper took place). 

  • A small circle or gathering of specialists (writers etc). 

parlor

noun
  • The living room of a house, or a room for entertaining guests; a room for talking; a sitting-room or drawing room 

  • A shed used for milking cattle. 

  • A shop or other business selling goods specified by context. 

  • A covered open-air patio. 

How often have the words cenacle and parlor occurred in a corpus of books? (source: Google Ngram Viewer )