natter vs yackety-yak

natter

verb
  • To talk casually; to discuss unimportant matters. 

  • To nag. 

noun
  • Mindless and irrelevant chatter. 

yackety-yak

verb
  • To talk pointlessly and uninterruptedly. 

noun
  • prolonged chatter; uninterrupted, idle talk; gossip 

How often have the words natter and yackety-yak occurred in a corpus of books? (source: Google Ngram Viewer )