fraud vs slush fund

fraud

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

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

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

  • A person who performs any such trick. 

slush fund

noun
  • Money stored for illegal or dishonest purposes. 

  • Money that has not been hypothecated or dedicated to a particular purpose, or which is used for a different purpose than originally intended. 

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