Libra vs Plough

Libra

name
  • A constellation of the zodiac, supposedly shaped like a set of scales. 

  • The astrological sign for the scales, ruled by Venus and covering September 24 - October 23 (tropical astrology) or October 16 - November 16 (sidereal astrology). 

noun
  • Someone with a Libra star sign 

Plough

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

  • A surname. 

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