expulsion vs voiding

expulsion

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

voiding

noun
  • That which is voided; that which is ejected or evacuated; a remnant; a fragment. 

  • An act by which something is voided, such as urination. 

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