Angara River vs river

Angara River and river both are nouns.

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

Angara River (noun)	river (noun)
a river in southeastern Siberia that flows northwest from Lake Baikal to become a tributary of the Yenisei River	a large natural stream of water (larger than a creek)