grimace vs mouthing

grimace

noun
  • A contorted facial expression, often expressing contempt or pain. 

verb
  • To make grimaces; to distort one's face; to make faces. 

mouthing

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

  • Ranting; passionate speech devoid of meaning. 

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