Borough vs Circle

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). 

Circle

name
  • the Circle line of the London Underground, originally the Inner Circle. 

  • A town, the county seat of McCone County, Montana, United States. Named after a cattle brand in the form of a circle. 

  • A census-designated place in Yukon-Koyukuk Census Area, Alaska, United States. Erroneously thought to be on the Arctic Circle, which is 50 miles further north. 

  • A surname from German. 

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