city vs Dallas

city and Dallas both are nouns.

Word	Noun	Adjective	Verb	Adverb
city	Yes	No	No	No
Dallas	Yes	No	No	No

city (noun)	Dallas (noun)
people living in a large densely populated municipality	a large commercial and industrial city in northeastern Texas located in the heart of the northern Texas oil fields
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter