chinwag vs rumour

chinwag

verb
  • To chat, to gossip. 

noun
  • An informal conversation, usually about everyday matters; a chat, a gossip. 

rumour

verb
  • Commonwealth standard spelling of rumor. 

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

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