heavy metal vs peashooter

heavy metal

noun
  • guns or shot of large size. 

  • A genre descended from rock music, characterized by massive sound, highly amplified distortion, and overall loudness, often with extended guitar solos, and lyrics that involve aggressive or fantastic imagery. 

  • Any metal that has a specific gravity greater than about 5, especially one, such as lead, that is poisonous and may be a hazard in the environment. (There are many different definitions of what counts as a heavy metal; see Heavy metals for a discussion.) 

  • Great influence or power. 

peashooter

noun
  • Any small or ineffective gun. 

  • A toy gun, consisting of a tube through which peas or small objects are blown. 

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