caput vs wetback

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. 

wetback

noun
  • A person of the mestizo race; a mojado. 

  • A Mexican or Central American who illegally enters the United States of America from its southern border. 

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