river vs Elbe River

river and Elbe River both are nouns.

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

river (noun)	Elbe River (noun)
a large natural stream of water (larger than a creek)	a river in central Europe that arises in northwestern Czechoslovakia and flows northward through Germany to empty into the North Sea