brain vs fathead

brain

verb
  • To strike (someone) on the head. 

  • To destroy; to put an end to. 

  • To dash out the brains of; to kill by smashing the skull. 

noun
  • A part of the brain, especially associated with particular mental functions, abilities, etc. 

  • Mind. 

  • A loose compartment of a backpack that straps on over the top opening. 

  • An intellectual or mental capacity. 

  • A person who provides the intelligence required for something. 

  • By analogy with a human brain, the part of a machine or computer that performs calculations. 

  • Oral sex. 

  • An intelligent person. 

  • Intellect. 

  • The control center of the central nervous system of an animal located in the skull which is responsible for perception, cognition, attention, memory, emotion, and action. 

fathead

noun
  • An idiot; a fool. 

  • A blobfish, Psychrolutes microporos 

  • Any of several species of fish of the genus Cubiceps 

  • A labroid food fish of California; the California sheephead. Semicossyphus pulcher. 

  • A cyprinid fish of the Mississippi valley, Pimephales promelas, the black-headed minnow. 

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