pedagogue vs professor

pedagogue

noun
  • A teacher or instructor of children; one whose occupation is to teach the young. 

  • A pedant; one who by teaching has become overly formal or pedantic in his or her ways; one who has the manner of a teacher. 

  • A slave who led the master's children to school, and had the charge of them generally. 

verb
  • To teach. 

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. 

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