city vs Haiphong

city and Haiphong both are nouns.

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

city (noun)	Haiphong (noun)
people living in a large densely populated municipality	a port city in northern Vietnam; industrial center
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter