Oder River vs river

Oder River and river both are nouns.

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

Oder River (noun)	river (noun)
a European river which rises in the Czech republic and flows through western Poland; flows into the Baltic Sea	a large natural stream of water (larger than a creek)