slush fund vs swindling

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. 

swindling

noun
  • The act by which somebody is swindled. 

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