archaeology vs ditch

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 

ditch

noun
  • A trench; a long, shallow indentation, as for irrigation or drainage. 

  • A raised bank of earth and the hedgerow on top. 

verb
  • To dig ditches around. 

  • To dig ditches. 

  • To throw into a ditch. 

  • To discard or abandon. 

  • To deliberately not attend classes; to play hookey. 

  • To deliberately crash-land an airplane on water. 

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