town vs township

town and township both are nouns.

Word	Noun	Adjective	Verb	Adverb
town	Yes	No	No	No
township	Yes	No	No	No

As nouns, town and township are synonyms defined as:

town (noun)	township (noun)
the people living in a municipality smaller than a city	an administrative division of a county
an urban area with a fixed boundary that is smaller than a city
an administrative division of a county