blooper vs mainmast

blooper

noun
  • A gaff-rigged fore-and-aft sail set from and aft of the aftmost mast of a square-rigged ship; a spanker. 

  • A fly ball that is weakly hit just over the infielders. 

  • The Vietnam-era M79 grenade launcher (due to its distinctive report). 

  • A filmed or videotaped outtake that has recorded an amusing accident and/or mistake. 

  • A blunder, an error. 

mainmast

noun
  • The tallest mast of a sailing ship that has more than one mast; particularly a full-rigged ship. 

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