urban center vs Frankfort

urban center and Frankfort both are nouns.

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

urban center (noun)	Frankfort (noun)
a large and densely populated urban area; may include several independent administrative districts	a German city; an industrial and commercial and financial center
	the capital of Kentucky; located in northern Kentucky