city vs San Bernardino

city and San Bernardino both are nouns.

Word	Noun	Adjective	Verb	Adverb
city	Yes	No	No	No
San Bernardino	Yes	No	No	No

city (noun)	San Bernardino (noun)
people living in a large densely populated municipality	a city in southern California to the east of Los Angeles
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter