river vs Caloosahatchee River

river and Caloosahatchee River both are nouns.

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

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