bonce vs caput

bonce

noun

  • The human head. 

caput

noun

  • The head. 

  • A knob-like protuberance or capitulum. 

  • The top or superior part of a thing. 

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

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