urban center vs Bam

urban center and Bam both are nouns.

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

urban center (noun)	Bam (noun)
a large and densely populated urban area; may include several independent administrative districts	an ancient city in southeastern Iran; destroyed by an earthquake in 2003