professor vs undergraduate

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. 

undergraduate

noun
  • A student at a university who has not yet received a degree. 

adj
  • Of, relating to, or being an undergraduate. 

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