metropolis vs Santa Clara

metropolis and Santa Clara both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Santa Clara	Yes	No	No	No

metropolis (noun)	Santa Clara (noun)
people living in a large densely populated municipality	a city of west central California; residential area with light industry
a large and densely populated urban area; may include several independent administrative districts