fiction vs old saw

fiction

noun
  • A verbal or written account that is not based on actual events (often intended to mislead). 

  • Literary type using invented or imaginative writing, instead of real facts, usually written as prose. 

  • A legal fiction. 

old saw

noun
  • A cliché, saying, or overused expression; especially a proverb or maxim. 

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