river vs San Joaquin River

river and San Joaquin River both are nouns.

Word	Noun	Adjective	Verb	Adverb
river	Yes	No	No	No
San Joaquin River	Yes	No	No	No

river (noun)	San Joaquin River (noun)
a large natural stream of water (larger than a creek)	a river in central California that rises in the Sierra Nevada and flows northwest to form a large delta with the Sacramento River