superficies vs zenith

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. 

zenith

noun
  • The point in the sky vertically above a given position or observer; the point in the celestial sphere opposite the nadir. 

  • The highest point in the sky reached by a celestial body. 

  • Highest point or state; peak. 

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