falsification vs figment of the imagination

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 

figment of the imagination

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