amateur vs professor

amateur

noun
  • A person attached to a particular pursuit, study, science, or art (such as music or painting), especially one who cultivates any study, interest, taste, or attachment without engaging in it professionally. 

  • Someone who is unqualified or insufficiently skillful. 

adj
  • Showing a lack of professionalism, experience or talent. 

  • Non-professional. 

  • Created, done, or populated by amateurs or non-professionals. 

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 amateur and professor occurred in a corpus of books? (source: Google Ngram Viewer )