fathead vs spider monkey

fathead

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

  • 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. 

spider monkey

noun
  • A muriqui, New World monkey of the genus Brachyteles, closely related to Ateles. 

  • Any New World monkey of the genus Ateles, with long, spindly limbs. 

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