Clinch River vs river

Clinch River and river both are nouns.

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

Clinch River (noun)	river (noun)
a river that rises in southwestern Virginia and flows generally southwestward across eastern Tennessee to the Tennessee River	a large natural stream of water (larger than a creek)