Borough vs City

Borough

name
  • The area, properly called Southwark, just south of London Bridge, which is at the north end of Borough High Street (OS grid ref TQ3279). 

City

name
  • The borough of Manhattan, the historic core of New York. 

  • Any of several other cities in metropolitan areas (such as San Francisco). 

  • The United Kingdom's financial industries, which are principally based in the City of London. 

  • Manchester City Football Club, an English football club. 

  • The City of London, the historic core of London where the Roman settlement of Londinium was established. 

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