urban center vs Lubbock

urban center and Lubbock both are nouns.

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

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