mouthing vs sneer

mouthing

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

  • Ranting; passionate speech devoid of meaning. 

sneer

noun
  • A facial expression where one slightly raises one corner of the upper lip, generally indicating scorn. 

  • A display of contempt; scorn. 

verb
  • To utter with a grimace or contemptuous expression; to say sneeringly. 

  • To raise a corner of the upper lip slightly, especially in scorn 

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