Tangshan vs urban center

Tangshan and urban center both are nouns.

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

Tangshan (noun)	urban center (noun)
an industrial city of northeastern China in Hebei province	a large and densely populated urban area; may include several independent administrative districts