Yukon River vs river

Yukon River and river both are nouns.

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

Yukon River (noun)	river (noun)
a North American river that flows westward from the Yukon Territory through central Alaska to the Bering Sea	a large natural stream of water (larger than a creek)