introduce vs mention

introduce

verb
  • To make (something or someone) known by formal announcement or recommendation. 

  • To cause (someone) to be acquainted (with someone else). 

  • To add (something) to a system, a mixture, or a container. 

  • To bring (something) into practice. 

mention

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

  • To make a short reference to something. 

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. 

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