abend vs discontinuation

abend

noun
  • Termination of a process prior to completion. 

  • The abnormal termination of a program. 

verb
  • To terminate abnormally. 

discontinuation

noun
  • The process of quitting a course of treatment with a drug. 

  • The act of stopping producing or supplying a product. 

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