break-off vs breakup

break-off

noun
  • A break, discontinuance, or interruption 

  • That which breaks off, or is broken off 

  • The first shot in a game of snooker or other cue-game 

verb
  • To play the first shot in a game of snooker 

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. 

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