abrade vs acerbate

abrade

verb
  • To wear down or exhaust, as a person; irritate. 

  • To cause the surface to become more rough. 

  • To undergo abrasion. 

  • To rub or wear off; erode. 

  • To irritate by rubbing; chafe. 

acerbate

verb
  • To exasperate; to irritate. 

  • To make bitter or sour. 

adj
  • Embittered; having a sour disposition or nature. 

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