expulsion vs investiture

expulsion

noun
  • The act of expelling or the state of being expelled. 

investiture

noun
  • The formal installation or, generally, the appointment of a bishop, or (uncountable) bishops in general. 

  • The act of investing, as with possession or power; formal bestowal or presentation of a possessory or prescriptive right. 

  • That which invests or clothes; covering; vestment. 

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