city vs Oakland

city and Oakland both are nouns.

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

city (noun)	Oakland (noun)
people living in a large densely populated municipality	a city in western California on San Francisco Bay opposite San Francisco; primarily and industrial urban center
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter