mention vs request

mention

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. 

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. 

request

verb
  • To ask for (something). 

  • To ask (somebody) to do something. 

noun
  • A message sent over a network to a server. 

  • Act of requesting (with the adposition at in the presence of possessives, and on in their absence). 

  • Condition of being sought after. 

  • A formal message requesting something. 

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