professor vs schoolmarm

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. 

schoolmarm

noun
  • A female teacher, especially one seen to be old-fashioned and extremely severe and strict. 

  • A tree with two or more trunks; a forked tree. 

  • Someone who acts like a schoolmarm; a person acting harsh and stern. 

verb
  • To discipline in the manner of a schoolmarm; to harshly reprimand or chide. 

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