acerbate vs boohoo

acerbate

verb
  • To make bitter or sour. 

  • To exasperate; to irritate. 

adj
  • Embittered; having a sour disposition or nature. 

boohoo

verb
  • To complain, whine. 

  • To cry, weep. 

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