emptying vs voiding

emptying

noun
  • The act by which something is emptied. 

voiding

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

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

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