graphic novel vs manga

graphic novel

noun
  • A comic book containing a single full non-episodic story. 

manga

noun
  • A comic in manga style, regardless of the country of origin. 

  • An artistic style heavily used in, and associated with, Japanese comics, and that has also been adopted by a comparatively low number of comics from other countries. 

  • A covering for a crucifix. 

  • A comic originating in Japan. 

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