schmooze vs yackety-yak

schmooze

noun
  • A casual conversation, especially one held in order to gain an advantage or make a social connection. 

verb
  • To talk casually, especially in order to gain an advantage or make a social connection. 

yackety-yak

noun
  • prolonged chatter; uninterrupted, idle talk; gossip 

verb
  • To talk pointlessly and uninterruptedly. 

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