breakup vs pile-up

breakup

noun
  • The act of breaking up; disintegration or division. 

  • The termination of a friendship or a romantic relationship. 

  • The time of year during which winter ice covering bodies of water disintegrates; more generally, spring. 

  • A loss of emotional control; a breakdown. 

pile-up

noun
  • An accumulation that occurs over time, especially one which is not welcome. 

  • A pile of tackling players. 

  • A pile of crashed vehicles due to a traffic accident. 

How often have the words breakup and pile-up occurred in a corpus of books? (source: Google Ngram Viewer )