archaeology vs cavern

archaeology

noun
  • the actual excavation, examination, analysis and interpretation. 

  • the actual remains together with their location in the stratigraphy. 

  • the academic subject; in the USA: one of the four sub-disciplines of anthropology. 

  • The study of the past by excavation and analysis of its material remains 

cavern

noun
  • A large cave. 

  • A large, dark place or space. 

  • An underground chamber. 

verb
  • To put into a cavern. 

  • To form a cavern or deep depression in. 

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