municipality vs township

municipality

noun
  • The governing body of such a district. 

  • A district with a government that typically encloses no other governed districts; a borough, city, or incorporated town or village. 

  • In Mexico and other Spanish- and Portuguese-speaking countries, second-level administrative divisions that may house one or more cities or towns whose head of government may be called mayors or, in Mexico, municipal presidents. 

township

noun
  • A subdivision of a county. 

  • A nonwhite (usually subeconomic) area attached to a city. 

  • A small town. 

  • The territory of a town. 

  • An area set aside for nonwhite occupation. 

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