urban center vs Sur

urban center and Sur both are nouns.

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

urban center (noun)	Sur (noun)
a large and densely populated urban area; may include several independent administrative districts	a port in southern Lebanon on the Mediterranean Sea; formerly a major Phoenician seaport famous for silks