rumor mill vs town crier

rumor mill

noun
  • A process in which a group or network of persons originate or promulgate gossip and other unsubstantiated claims. 

town crier

noun
  • A gossip 

  • A person who is employed by a town council to make public announcements in the streets 

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