expel vs initiate

expel

verb
  • To eject or erupt. 

  • To remove from membership. 

  • To deport. 

initiate

verb
  • To do the first act; to perform the first rite; to take the initiative. 

  • To instruct in the rudiments or principles; to introduce. 

  • To confer membership on; especially, to admit to a secret order with mysterious rites or ceremonies. 

  • To begin; to start. 

noun
  • One who is oriented in and familiar with a topic or subject; especially, one who is an expert in it. 

  • A new member of an organization. 

  • One who has been through a ceremony of initiation. 

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