enemy vs professor

enemy

noun
  • A hostile force or nation; a fighting member of such a force or nation. 

  • Something harmful or threatening to another 

  • Someone who is hostile to, feels hatred towards, opposes the interests of, or intends injury to someone else. 

  • Of, by, relating to, or belonging to an enemy. 

  • A non-player character that tries to harm the player. 

verb
  • To make an enemy of. 

professor

noun
  • The most senior rank for an academic at a university or similar institution, informally also known as "full professor." 

  • A teacher or faculty member at a college or university regardless of formal rank. 

  • A pianist in a saloon, brothel, etc. 

  • The puppeteer who performs a Punch and Judy show; a Punchman. 

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