urban center vs Nakuru

urban center and Nakuru both are nouns.

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

urban center (noun)	Nakuru (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in western Kenya; commercial center of an agricultural region