discontinuance vs incompletion

discontinuance

noun
  • The occurrence of something being discontinued; a cessation; an incomplete ending. 

incompletion

noun
  • Something which is not completed. 

  • A forward pass which is not caught inbounds by the intended receiver. 

  • The state or quality of not being complete. 

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