Yukon vs Yukon River

Yukon and Yukon River both are nouns.

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

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

Yukon and Yukon River: a North American river that flows westward from the Yukon Territory through central Alaska to the Bering Sea

Yukon (noun)	Yukon River (noun)
a territory in northwestern Canada; site of the Klondike gold rush in the 1890s	a North American river that flows westward from the Yukon Territory through central Alaska to the Bering Sea
a North American river that flows westward from the Yukon Territory through central Alaska to the Bering Sea