Orinoco River vs river

Orinoco River and river both are nouns.

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

Orinoco River (noun)	river (noun)
a South American river 1,500 miles long; flows into the South Atlantic	a large natural stream of water (larger than a creek)