Mosul vs urban center

Mosul and urban center both are nouns.

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

Mosul (noun)	urban center (noun)
a city in northern Iraq on the Tigris across from the ruins of Nineveh	a large and densely populated urban area; may include several independent administrative districts