Memphis vs urban center

Memphis and urban center both are nouns.

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

Memphis (noun)	urban center (noun)
largest city of Tennessee; located in southwestern Tennessee on bluffs overlooking the Mississippi River	a large and densely populated urban area; may include several independent administrative districts
an ancient city of Egypt on the Nile (south of Cairo)