Haiphong vs urban center

Haiphong and urban center both are nouns.

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

Haiphong (noun)	urban center (noun)
a port city in northern Vietnam; industrial center	a large and densely populated urban area; may include several independent administrative districts