Natal vs urban center

Natal and urban center both are nouns.

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

Natal (noun)	urban center (noun)
a region of eastern South Africa on the Indian Ocean	a large and densely populated urban area; may include several independent administrative districts
a port city in northeastern Brazil