placate vs vex

placate

verb
  • To calm; to bring peace to; to influence someone who was furious to the point that they become content or at least no longer irate. 

vex

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

  • To twist, to weave. 

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

  • To annoy, irritate. 

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