gagman vs pierrot

gagman

noun
  • A writer or performer of gags. 

pierrot

noun
  • An 18th-century women's low-cut basque with sleeves. 

  • Any of various lycaenid butterflies of the genera Tarucus and Castalia, notable for white contrasting with brown or black on the underwings. 

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