confirmed facts vs rumor

confirmed facts

rumor

verb
  • To tell a rumor about; to gossip. 

noun
  • A statement or claim of questionable accuracy, from no known reliable source, usually spread by word of mouth. 

  • Information or misinformation of the kind contained in such claims. 

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