Mohawk River vs river

Mohawk River and river both are nouns.

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

Mohawk River (noun)	river (noun)
a river of central New York that flows southeastward to the Hudson River	a large natural stream of water (larger than a creek)