mention vs mouthing

mention

noun
  • A speaking or notice of anything, usually in a brief or cursory manner. Used especially in the phrase make mention of. 

  • A social media feed, a list of replies or posts mentioning a person. 

verb
  • To make a short reference to something. 

  • To utter a word or expression in order to refer to the expression itself, as opposed to its usual referent. 

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