final act vs sunset

final act

noun
  • A final performance or accomplishment, before one's retirement or ultimate demise. 

  • The last part of a play, film, or narrative in which the strands of the plot are drawn together and matters are explained. 

sunset

noun
  • The final period of the life of a person or thing. 

  • The moment each evening when the sun disappears below the western horizon. 

  • A set termination date. 

  • The changes in color of the sky before and after sunset. 

  • The region where the sun sets; the west. 

verb
  • To phase out. 

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