banger vs knocker

banger

noun
  • A woman's breast. 

  • A powerfully energetic piece of music, especially dance music. 

  • A Bangalore torpedo. 

  • A car or an engine; referring to the cylinders of an engine in a car. From the explosive bangs on every cylinder firing. 

  • One of the rocks that end up crashing against another, making banging sounds, after a throw. 

  • One of the rocks that results in a score at the finish of an end. 

  • An old, worn-out car. From a stereotypical one backfiring, making banging noises. 

  • Any particularly good or pleasing thing. 

  • A person who has sex. 

  • A sausage. 

  • A firework that makes a bang. 

  • A man's penis. 

knocker

noun
  • A woman's breast. 

  • A person who knocks. 

  • A critic; one who disparages. 

  • A person who knocks (denigrates) something. 

  • One who defaults on payment of a wager. 

  • A large cockroach, especially Blaberus giganteus, of semitropical America, which is able to produce a loud knocking sound. 

  • A large, boulder-shaped outcrop of bedrock in an otherwise low-lying landscape, chiefly associated with a mélange. 

  • A device, usually hinged with a striking plate, used for knocking on a door. 

  • A mechanical device in a pinball table that produces a loud percussive noise. 

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