consideration vs slush fund

consideration

noun
  • A payment or other recompense for something done. 

  • Importance, claim to notice, regard. 

  • Something considered as a reason or ground for a (possible) decision. 

  • The tendency to consider others. 

  • The thought process of considering, of taking multiple or specified factors into account (with of being the main corresponding adposition). 

  • A matter of inducement for something promised; something valuable given as recompense for a promise, which causes the promise to become binding as a contract. 

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 consideration and slush fund occurred in a corpus of books? (source: Google Ngram Viewer )