Tower vs Zodiac

Tower

name
  • A habitational surname.; Alternative form of Towers 

  • The Tower of London, especially seen as a place of imprisonment or punishment. 

noun
  • Denoting the system of weights used by the Saxon and Norman English kings in their minting of coins. 

Zodiac

name
  • a family of constellations that are visible in the apparent path of the Sun viewed from the Earth over the year 

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