last word vs nonesuch

last word

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

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

  • The final statement uttered by a person before death. 

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

nonesuch

noun
  • A person or thing with no equal. 

  • Silene chalcedonica (syn. Lychnis chalcedonica) 

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