Karachi vs city

Karachi and city both are nouns.

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

Karachi (noun)	city (noun)
the largest city in Pakistan; located in southeastern Pakistan; an industrial center and seaport on the Arabian Sea; former capital of Pakistan	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts
	an incorporated administrative district established by state charter