counselor vs professor

counselor

noun
  • A school counselor, often in a specialty such as careers, education, or health. 

  • A children’s supervisor, usually at camp. 

  • A professional who counsels people, especially on personal problems. 

  • An attorney. 

  • A high ranking diplomat, usually just below an ambassador or minister. 

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