urban center vs Joppa

urban center and Joppa both are nouns.

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

urban center (noun)	Joppa (noun)
a large and densely populated urban area; may include several independent administrative districts	a port in western Israel on the Mediterranean; incorporated into Tel Aviv in 1950