Weser River vs river

Weser River and river both are nouns.

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

Weser River (noun)	river (noun)
a river in northwestern Germany that flows northward to the North Sea near Bremerhaven	a large natural stream of water (larger than a creek)