houlet vs owlet

houlet

noun
  • An owl. 

  • An owlet. 

owlet

noun
  • A young owl; owling. 

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

  • An owlet moth. 

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