Plough vs Wolf

Plough

name
  • The brightest seven stars of the constellation Ursa Major. They are Alkaid, Mizar, Alioth, Megrez, Dubhe, Merak, and Phecda. 

  • A surname. 

Wolf

name
  • The constellation Lupus. 

  • A surname transferred from the given name. 

  • A male given name 

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