Oder River vs Oder

Oder River and Oder both are nouns.

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

As nouns, Oder River and Oder are synonyms defined as:

Oder River and Oder: a European river which rises in the Czech republic and flows through western Poland; flows into the Baltic Sea

Oder River (noun)	Oder (noun)
a European river which rises in the Czech republic and flows through western Poland; flows into the Baltic Sea	a European river which rises in the Czech republic and flows through western Poland; flows into the Baltic Sea