art gallery vs parlor

art gallery

noun
  • A room, group of rooms, or other space where works of art are placed on display, possibly for sale. 

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 art gallery and parlor occurred in a corpus of books? (source: Google Ngram Viewer )