Semarang vs urban center

Semarang and urban center both are nouns.

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

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