acting vs lead character

acting

noun
  • The occupation of an actor. 

  • Pretending. 

  • Something done by a party — so called to avoid confusion with the legal senses of deed and action. 

adj
  • Temporarily assuming the duties or authority of another person when they are unable to do their job. 

lead character

noun
  • The main protagonist in a work. 

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