urban center vs Semarang

urban center and Semarang both are nouns.

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

urban center (noun)	Semarang (noun)
a large and densely populated urban area; may include several independent administrative districts	a port city is southern Indonesia; located in northern Java