town vs Rock Island

town and Rock Island both are nouns.

Word	Noun	Adjective	Verb	Adverb
town	Yes	No	No	No
Rock Island	Yes	No	No	No

town (noun)	Rock Island (noun)
the people living in a municipality smaller than a city	a town in northwest Illinois on the Mississippi River; site of a Union prison during the American Civil War
an urban area with a fixed boundary that is smaller than a city
an administrative division of a county