comic book vs memorandum

comic book

noun
  • A book or magazine that uses sequences of drawings to tell a story or series of stories, primarily in serialized form, usually fiction. 

memorandum

noun
  • A short note serving as a reminder. 

  • A brief diplomatic communication. 

  • A written business communication. 

  • A page in an annual publication honoring the memory of a person who died during the past year. 

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