metropolis vs civic center

metropolis and civic center both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
civic center	Yes	No	No	No

metropolis (noun)	civic center (noun)
people living in a large densely populated municipality	a center where the members of a community can gather for social or cultural activities
a large and densely populated urban area; may include several independent administrative districts	the center of a city