urban center vs Tianjin

urban center and Tianjin both are nouns.

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

urban center (noun)	Tianjin (noun)
a large and densely populated urban area; may include several independent administrative districts	a major industrial center in northeastern China on the Grand Canal near the Yellow Sea; 3rd largest city in China