Tower vs Trench

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. 

Trench

name

  • A habitational surname. 

  • A suburb of Telford, Telford and Wrekin borough, Shropshire, England (OS grid ref SJ6912). 

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