acerbate vs pout

acerbate

verb
  • To make bitter or sour. 

  • To exasperate; to irritate. 

adj
  • Embittered; having a sour disposition or nature. 

pout

verb
  • To be or pretend to be ill-tempered; to sulk. 

  • To shoot poults. 

  • To push out one's lips. 

  • To thrust itself outward; to be prominent. 

  • To say while pouting. 

noun
  • A fit of sulking or sullenness. 

  • One's facial expression when pouting. 

  • Any of various fishes such as the hornpout (Ameiurus nebulosus, the brown bullhead), the pouting (Trisopterus luscus) and the eelpouts (Zoarcidae). 

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