memoir vs portrait

memoir

noun
  • Any form of narrative describing the personal experiences of a writer. 

  • A biography; a book describing the experiences of a subject from personal knowledge of the subject or from sources with personal knowledge of the subject. 

  • An autobiography; a book describing the personal experiences of an author. 

portrait

noun
  • An accurate depiction of a person, a mood, etc. 

  • A print orientation where the vertical sides are longer than the horizontal sides. 

  • A painting or other picture of a person, especially the head and shoulders. 

adj
  • Representing the actual features of an individual; not ideal. 

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