river vs Yangtze River

river and Yangtze River both are nouns.

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

river (noun)	Yangtze River (noun)
a large natural stream of water (larger than a creek)	the longest river of Asia; flows eastward from Tibet into the East China Sea near Shanghai