blabbermouth vs rumour

blabbermouth

noun
  • A gossip. 

  • A person who talks excessively. 

  • A kind of foam-dispensing nozzle used in firefighting at airports. 

rumour

noun
  • Britain, Canada, New Zealand, Australia, and Ireland spelling of rumor 

verb
  • Commonwealth standard spelling of rumor. 

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