final act vs windup

final act

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

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

windup

noun
  • The last part of something; a conclusion. 

  • A practical joke or tease. 

  • A long explanation of some line of thought to reach a certain conclusion. 

  • The act of preparing for a certain style of pitching. 

  • The act of ending or concluding something. 

adj
  • Operated by a coiled spring that is wound by hand. 

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