explaining vs rejoinder

explaining

noun
  • explanation 

rejoinder

noun
  • A response that answers another response. 

  • The defendant's answer to the replication. 

  • Re-insertion, typically after allowance of a patent application, of patent claims that had been withdrawn from examination under a restriction requirement. 

  • A quick response that involves disagreement or is witty, especially an answer to a question. 

verb
  • To issue a rejoinder. 

  • To say as a rejoinder. 

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