Lubbock vs urban center

Lubbock and urban center both are nouns.

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

Lubbock (noun)	urban center (noun)
a city in northwest Texas to the south of Amarillo	a large and densely populated urban area; may include several independent administrative districts