Borough vs Warden

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). 

Warden

name
  • A village and civil parish in south Northumberland, England (OS grid ref NY9166). 

  • A surname originating as an occupation for a warden. 

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