biography vs work of fiction

biography

noun
  • The art of writing this kind of story. 

  • A person's life story, especially one published. 

verb
  • To write a biography of. 

work of fiction

noun
  • A fictional account; a story. 

  • A fictitious account; an account of events that never took place. 

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