disclosure vs muzzling

disclosure

noun
  • The act of revealing something. 

  • That which is disclosed; a previously hidden fact or series of facts that is made known. 

  • The making known of a previously hidden fact or series of facts to another party; the act of disclosing. 

muzzling

noun
  • The act of placing a muzzle on an animal. 

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