urban center vs Seyhan

urban center and Seyhan both are nouns.

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

urban center (noun)	Seyhan (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in southern Turkey on the Seyhan River
	a Turkish river flowing south southwest into the Mediterranean