Meuse River vs river

Meuse River and river both are nouns.

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

Meuse River (noun)	river (noun)
an American operation in World War I (1918); American troops under Pershing drove back the German armies which were saved only by the armistice on November 11	a large natural stream of water (larger than a creek)
a European river; flows into the North Sea