river vs Kissimmee River

river and Kissimmee River both are nouns.

Word	Noun	Adjective	Verb	Adverb
river	Yes	No	No	No
Kissimmee River	Yes	No	No	No

river (noun)	Kissimmee River (noun)
a large natural stream of water (larger than a creek)	a river of central Florida that flows southward to Lake Okeechobee