last word vs proem

last word

noun
  • Concluding remark; final advice, instructions, or observation. 

  • The finest, highest, or ultimate representative of some class of objects. 

  • The final statement uttered by a person before death. 

  • A final decision or remark, or the right to make one. 

proem

noun
  • An introduction, preface or preamble. 

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