autobiography vs work of fiction

autobiography

noun
  • A self-written biography; the story of one's own life. 

  • Biographies of this kind regarded as a literary genre. 

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 autobiography and work of fiction occurred in a corpus of books? (source: Google Ngram Viewer )