caput vs upper side

caput

noun
  • The top or superior part of a thing. 

  • A knob-like protuberance or capitulum. 

  • The head. 

  • The council or ruling body of the University of Cambridge prior to the constitution of 1856. 

upper side

noun
  • The uppermost side of anything 

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