Groznyy vs urban center

Groznyy and urban center both are nouns.

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

Groznyy (noun)	urban center (noun)
the capital of Chechnya in southwestern Russia; center of extensive oil fields	a large and densely populated urban area; may include several independent administrative districts