speech bubble vs vaudeville

speech bubble

noun
  • A rounded outline, containing words, representing speech in a cartoon. 

vaudeville

noun
  • An entertainment in this style. 

  • A style of multi-act theatrical entertainment which originated from France and flourished in Europe and North America from the 1880s through the 1920s. 

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