urban center vs Grenoble

urban center and Grenoble both are nouns.

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

urban center (noun)	Grenoble (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in southeastern France on the Isere River