break-off vs breakoff

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 

breakoff

noun

  • discontinuance (act of breaking off) 

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