downstairs vs mezzanine

downstairs

noun
  • The lower floor of a house, at ground level; especially the servants’ quarters. 

  • The genitalia. 

adv
  • Down the stairs. 

  • In or to hell. 

  • Regarding the genitalia. 

adj
  • Located on a lower floor. 

mezzanine

noun
  • An apartment, room, etc., on such an intermediate floor. 

  • An intermediate floor or storey in between the main floors of a building; specifically, one that is directly above the ground floor which does not extend over the whole floorspace of the building, and so resembles a large balcony overlooking the ground floor; an entresol. 

  • The lowest balcony in an auditorium, cinema, theatre, etc.; the dress circle. 

verb
  • To fit (a building or other place) with a mezzanine floor. 

adj
  • Characteristic of or relating to high-interest loans which have no collateral, and are regarded as intermediate in nature, ranking above equity but below secured loans. 

  • Fulfilling an intermediate or secondary function. 

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