Samarkand vs urban center

Samarkand and urban center both are nouns.

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

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