chinwag vs yatter

chinwag

verb
  • To chat, to gossip. 

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

yatter

verb
  • To natter; to prattle; to chatter mindlessly. 

noun
  • Natter; prattle; mindless chatter. 

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