river vs Chattahoochee

river and Chattahoochee both are nouns.

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

river (noun)	Chattahoochee (noun)
a large natural stream of water (larger than a creek)	a river rising in northern Georgia and flowing southwest and south to join the Flint River at the Florida border where they form the Apalachicola River