clip joint vs speakeasy

clip joint

noun
  • An establishment, usually a strip club or bar, in which customers are tricked into paying money only to receive poor goods or services or none at all. 

speakeasy

noun
  • An illegal saloon or tavern, especially one operated during the American Prohibition period in the 1920s. 

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