Seyhan vs urban center

Seyhan and urban center both are nouns.

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

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