Frankfort vs urban center

Frankfort and urban center both are nouns.

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

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