Salem vs urban center

Salem and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Salem	Yes	No	No	No
urban center	Yes	No	No	No

Salem (noun)	urban center (noun)
capital of the state of Oregon in the northwestern part of the state on the Willamette River	a large and densely populated urban area; may include several independent administrative districts
a city in northeastern Massachusetts; site of the witchcraft trials in 1692
a city in southern India