river vs Caloosahatchee

river and Caloosahatchee both are nouns.

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

river (noun)	Caloosahatchee (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