borough vs city center

borough

noun
  • A town having a municipal corporation and certain traditional rights. 

  • Other similar administrative units in cities and states in various parts of the world. 

  • A town or city. 

  • An administrative district in some cities, e.g., London. 

  • An administrative unit of a city which, under most circumstances according to state or national law, would be considered a larger or more powerful entity; most commonly used in American English to define the five counties that make up New York City. 

  • A district in Alaska having powers similar to a county. 

  • An association of men who gave pledges or sureties to the king for the good behaviour of each other. 

city center

noun
  • The central business and shopping area of a city. 

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