Caloosahatchee River vs river

Caloosahatchee River and river both are nouns.

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

Caloosahatchee River (noun)	river (noun)
a river in southern Florida that flows westerly to the Gulf of Mexico; forms the western end of the Cross-Florida Waterway	a large natural stream of water (larger than a creek)