encourage vs vex

encourage

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

  • To spur on, strongly recommend. 

  • To foster, give help or patronage 

vex

verb
  • To cause (mental) suffering to; to distress. 

  • To toss back and forth; to agitate; to disquiet. 

  • To twist, to weave. 

  • To annoy, irritate. 

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