riposte vs thank-you note

riposte

verb
  • To attempt to hit an opponent after parrying an attack. 

  • To respond quickly; particularly if the response is humorous. 

noun
  • An answer or reply, rapidly uttered, in response to a question or problem. 

  • A thrust given in return after parrying an attack. 

  • A counter-attack in any combat or any sport 

  • A quick and usually witty response to a taunt. 

thank-you note

How often have the words riposte and thank-you note occurred in a corpus of books? (source: Google Ngram Viewer )