concurrency vs qualification

concurrency

noun
  • The property or an instance of being concurrent; something that happens at the same time as something else. 

  • A property of systems where several processes execute at the same time. 

  • A stretch of road that is shared between two or more numbered or named routes. 

qualification

noun
  • A clause or condition which qualifies something; a modification, a limitation. 

  • An ability or attribute that aids someone's chances of qualifying for something; specifically, completed professional training. 

  • The act or process of qualifying for a position, achievement etc. 

  • A certificate, diploma, or degree awarded after successful completion of a course, training, or exam. 

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