encourage vs exasperate

encourage

verb
  • To foster, give help or patronage 

  • To mentally support; to motivate, give courage, hope or spirit. 

  • To spur on, strongly recommend. 

exasperate

verb
  • To tax the patience of; irk, frustrate, vex, provoke, annoy; to make angry. 

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