city vs medical center

city and medical center both are nouns.

Word	Noun	Adjective	Verb	Adverb
city	Yes	No	No	No
medical center	Yes	No	No	No

city (noun)	medical center (noun)
people living in a large densely populated municipality	the part of a city where medical facilities are centered
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter