blather vs yackety-yak

blather

verb
  • To talk rapidly without making much sense. 

  • To say (something foolish or nonsensical); to say (something) in a foolish or overly verbose way. 

noun
  • Nonsensical or foolish talk. 

yackety-yak

verb
  • To talk pointlessly and uninterruptedly. 

noun
  • prolonged chatter; uninterrupted, idle talk; gossip 

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