completion vs endgame

completion

noun
  • The act or state of being or making something complete; conclusion, accomplishment. 

  • The space resulting from such an act. 

  • The conclusion of an act of conveyancing concerning the sale of a property. 

  • The act of making a metric space complete by adding points. 

  • A forward pass that is successfully caught by the intended receiver. 

endgame

noun
  • The final stage of an extended process or course of events, especially with the implication of the imminent realization of a masterful strategy or plan. 

  • The final stage of a game of chess, when there are few pieces left. 

  • The final stage of any game. 

  • The gameplay available in a massively multiplayer online role-playing game for players who have completed all of the preset challenges. 

  • The final stage of a game of bridge, when there are few cards left. 

adj
  • Having become canon by the end of the plot of a work of fiction or speculated to be intended to become such. 

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