urban center vs T'ien-ching

urban center and T'ien-ching both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
T'ien-ching	Yes	No	No	No

urban center (noun)	T'ien-ching (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