biography vs folktale

biography

noun
  • The art of writing this kind of story. 

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

verb
  • To write a biography of. 

folktale

noun
  • A tale or story that is part of the oral tradition of a people or a place. 

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