jabber vs mouth off

jabber

verb
  • To talk rapidly, indistinctly, or unintelligibly; to utter gibberish or nonsense. 

  • To utter rapidly or indistinctly; to gabble. 

noun
  • Rapid or incoherent talk, with indistinct utterance; gibberish. 

  • One who or that which jabs. 

  • A kind of hand-operated corn planter. 

  • One who administers a hypodermic injection, especially of a COVID-19 vaccine. 

mouth off

verb
  • To talk impudently, especially to one's superior. 

  • To complain or otherwise express oneself in a loud, immoderate manner. 

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