urban center vs Samarkand

urban center and Samarkand both are nouns.

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

urban center (noun)	Samarkand (noun)
a large and densely populated urban area; may include several independent administrative districts	city in southern Uzbekistan; Tamerlane's opulent capital in the 14th century