announcement vs mouthing

announcement

noun
  • An act of announcing, or giving notice. 

  • That which conveys what is announced. 

  • The content which is announced. 

mouthing

noun
  • Ranting; passionate speech devoid of meaning. 

  • The act of forming a shape with the mouth, especially as part of sign language. 

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