Aden vs urban center

Aden and urban center both are nouns.

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

Aden (noun)	urban center (noun)
an important port of Yemen; located on the Gulf of Aden; its strategic location has made it a major trading center of southern Arabia since ancient times	a large and densely populated urban area; may include several independent administrative districts