falsification vs refutation

falsification

noun
  • the act of falsifying, or making false; a counterfeiting; the giving to a thing an appearance of something which it is not 

  • showing an item of charge in an account to be wrong 

  • knowingly false statement or wilful misrepresentation 

refutation

noun
  • An act of refuting or disproving; the disproving of an argument, opinion, testimony, doctrine or theory by argument or countervailing proof; evidence of falseness. 

  • A vocal answer to an attack on one's assertions. 

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