city vs Bam

city and Bam both are nouns.

Word	Noun	Adjective	Verb	Adverb
city	Yes	No	No	No
Bam	Yes	No	No	No

city (noun)	Bam (noun)
people living in a large densely populated municipality	an ancient city in southeastern Iran; destroyed by an earthquake in 2003
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter