forgery vs mirroring

forgery

noun
  • That which is forged, fabricated, falsely devised or counterfeited. 

  • The act of forging metal into shape. 

  • The act of forging, fabricating, or producing falsely; especially the crime of fraudulently making or altering a writing or signature purporting to be made by another, the false making or material alteration of or addition to a written instrument for the purpose of deceit and fraud. 

mirroring

noun
  • A reflection or inversion. 

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