backstair vs furniture

backstair

noun
  • The backstairs (stairs at the rear of a building). 

adj
  • clandestine, secret or furtive 

furniture

noun
  • Fittings, such as handles, of a door, coffin, or other wooden item. 

  • The harness, trappings etc. of a horse, hawk, or other animal. 

  • The stock and forearm of a weapon. 

  • Any material on the page other than the text and pictures of stories. 

  • A type of mixture organ stop. 

  • Large movable item(s), usually in a room, which enhance(s) the room's characteristics, functionally or decoratively. 

  • The pieces of wood or metal put round pages of type to make proper margins and fill the spaces between the pages and the chase. 

  • Impressive-looking books used for filling out the collection of a private library. 

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