Calgary vs urban center

Calgary and urban center both are nouns.

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

Calgary (noun)	urban center (noun)
the largest city in southern Alberta; an oil and gas center and a technology center for Alberta and most of western Canada	a large and densely populated urban area; may include several independent administrative districts