depart vs happen

depart

verb
  • To set out on a journey. 

  • To leave. 

  • To die. 

  • To disappear, vanish; to cease to exist. 

  • To go away from; to leave. 

  • To deviate (from), be different (from), fail to conform. 

happen

verb
  • To occur or take place. 

  • To do or occur by chance or unexpectedly. 

  • To encounter by chance. 

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