fathead vs owlet

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. 

owlet

noun
  • An owlet moth. 

  • One of a species of small owls, such as Athene noctua. 

  • A young owl; owling. 

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