acerbate vs molest

acerbate

verb
  • To exasperate; to irritate. 

  • To make bitter or sour. 

adj
  • Embittered; having a sour disposition or nature. 

molest

verb
  • To annoy intentionally. 

  • To disturb or tamper with. 

  • To sexually assault or sexually harass. 

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