river vs Yalu River

river and Yalu River both are nouns.

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

river (noun)	Yalu River (noun)
a large natural stream of water (larger than a creek)	a battle in the Korean War (November 1950); when UN troops advanced north to the Yalu River 200,000 Chinese troops crossed the river and drove them back
	river in eastern Asia; rises in North Korea and flows southwest to Korea Bay (forming part of the border between North Korea and China)