expulsion vs ouster

expulsion

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

ouster

noun
  • A putting out of possession; dispossession; ejection. 

  • Action by a cotenant that prevents another cotenant from enjoying the use of jointly owned property. 

  • Someone who ousts. 

  • Specifically, the forceful removal of a politician or regime from power; coup. 

verb
  • To oust. 

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