breathing vs mouthing

breathing

noun
  • Any gentle influence or operation; inspiration. 

  • The act of respiration; a single instance of this. 

  • Aspiration; secret prayer. 

  • A diacritical mark indicating aspiration or lack thereof. 

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 breathing and mouthing occurred in a corpus of books? (source: Google Ngram Viewer )