professor vs scholar

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. 

scholar

noun
  • A student; one who studies at school or college, typically having a scholarship. 

  • A specialist in a particular branch of knowledge. 

  • someone who received a prestigious scholarship 

  • A learned person; a bookman. 

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