converge vs depart

converge

verb
  • (said of a sequence or series) To have a (finite, proper) limit. 

  • (said of two or more entities) To approach each other; to get closer and closer. 

  • (said of an iterative process) To reach a stable end point. 

depart

verb
  • 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. 

  • To set out on a journey. 

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