request vs respond

request

verb
  • To ask (somebody) to do something. 

  • To ask for (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. 

respond

verb
  • To say something in return; to answer; to reply. 

  • To act in return; to carry out an action or in return to a force or stimulus; to do something in response. 

  • To satisfy; to answer. 

  • To correspond with; to suit. 

  • To be liable for payment. 

noun
  • A half-pillar, pilaster, or any corresponding device engaged in a wall to receive the impost of an arch. 

  • A versicle or short anthem chanted at intervals during the reading of a lection. 

  • A response. 

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