acerbate vs dyspeptic

acerbate

adj
  • Embittered; having a sour disposition or nature. 

verb
  • To exasperate; to irritate. 

  • To make bitter or sour. 

dyspeptic

adj
  • Irritable or morose. 

  • Of, relating to, or having dyspepsia or indigestion. 

noun
  • A dyspeptic person. 

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