fastigium vs superficies

fastigium

noun
  • An apex or summit; culmination. 

  • The most intense phase of a disease, especially a fever. 

  • A pediment or gable end. 

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 fastigium and superficies occurred in a corpus of books? (source: Google Ngram Viewer )