Governor vs politician

Governor

noun
  • The title for someone who holds the post of governor. 

politician

noun
  • One engaged in politics, especially an elected or appointed government official. 

  • Specifically, one who regards elected political office as a career. 

  • A sly or ingratiating person. 

  • A politically active or interested person. 

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