professor vs schoolman

professor

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

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

  • A pianist in a saloon, brothel, etc. 

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

schoolman

noun
  • A medieval writer, scholar or teacher of the subjects taught at early European universities (such as theology, metaphysics and logic); a scholastic. 

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