nadir vs superficies

nadir

verb
  • To extend (a beehive) by adding an empty box at the base. 

noun
  • The lowest point; time of greatest depression. 

  • The axis of a projected conical shadow; the direction of the force of gravity at a location; down. 

  • The point of the celestial sphere, directly opposite the zenith; inferior pole of the horizon; point of the celestial sphere directly under the place of observation. 

superficies

noun
  • The area of a two-dimensional surface. 

  • The surface (of something immaterial, especially of the mind or soul). 

  • A building intimately associated with the land on which it is built. 

  • The visible, external surface of a body. 

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