Plough vs Tail

Plough

name

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

  • A surname. 

Tail

name

  • A Chinese constellation coinciding with the tail of Scorpius, one of the 28 lunar mansions and the tail of Azure Dragon. 

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