acerbate vs snivel

acerbate

verb
  • To make bitter or sour. 

  • To exasperate; to irritate. 

adj
  • Embittered; having a sour disposition or nature. 

snivel

verb
  • To cry while sniffling; to whine or complain while crying. 

  • To breathe heavily through the nose while it is congested with nasal mucus. 

  • To say (something) while sniffling or crying. 

noun
  • The act of snivelling. 

  • Nasal mucus; snot. 

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