cumshaw vs shill

cumshaw

verb
  • To give or make a present to. 

noun
  • A gratuity or tip as thanks for a service 

shill

verb
  • To promote or endorse in return for payment, especially dishonestly. 

  • To put under cover; to sheal. 

noun
  • Any person paid to endorse a product. 

  • An accomplice at a confidence trick during an auction or gambling game. 

  • A house player in a casino. 

  • A person paid to endorse a product while pretending to be impartial. 

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