Chao Phraya River vs river

Chao Phraya River and river both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chao Phraya River	Yes	No	No	No
river	Yes	No	No	No

Chao Phraya River (noun)	river (noun)
a river in Thailand formed by the confluence of the Nan and Ping Rivers; flows southward past Bangkok and empties into the Gulf of Thailand	a large natural stream of water (larger than a creek)