fraud vs impostor

fraud

noun
  • The assumption of a false identity to such deceptive end. 

  • Any act of deception carried out for the purpose of unfair, undeserved and/or unlawful gain. 

  • A person who performs any such trick. 

  • The crime of stealing or otherwise illegally obtaining money by use of deception tactics. 

impostor

noun
  • Someone who attempts to deceive by using an assumed name or identity. 

  • A sprite or animation integrated into a three-dimensional scene, but not based on an actual 3D model. 

  • A term referenced in an unusual grammatical person. 

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