abend vs discontinuance

abend

noun
  • The abnormal termination of a program. 

  • Termination of a process prior to completion. 

verb
  • To terminate abnormally. 

discontinuance

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

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