invocation vs request

invocation

noun
  • The act or form of calling for the assistance or presence of some superior being, especially prayer offered to a divine being. 

  • The act of invoking, such as a function call. 

  • A call or summons, especially a judicial call, demand, or order. 

  • An act of invoking or claiming a legal right. 

request

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

  • A message sent over a network to a server. 

  • Condition of being sought after. 

  • A formal message requesting something. 

verb
  • To ask (somebody) to do something. 

  • To ask for (something). 

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