clodhopper vs owlet

clodhopper

noun
  • Wheatear; any of various passerine birds. 

  • Any kind of shoe. 

  • A strong shoe for heavy-duty use, a boot. 

  • A peasant or yokel. 

  • A clumsy or foolish person. 

  • United States Navy ankle length work shoes, distinct from dress shoes or combat boots. 

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 clodhopper and owlet occurred in a corpus of books? (source: Google Ngram Viewer )