town vs Johnson City

town and Johnson City both are nouns.

Word	Noun	Adjective	Verb	Adverb
town	Yes	No	No	No
Johnson City	Yes	No	No	No

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