Babylon vs urban center

Babylon and urban center both are nouns.

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

Babylon (noun)	urban center (noun)
the chief city of ancient Mesopotamia and capital of the ancient kingdom of Babylonia	a large and densely populated urban area; may include several independent administrative districts