river vs Chao Phraya River

river and Chao Phraya River both are nouns.

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

river (noun)	Chao Phraya River (noun)
a large natural stream of water (larger than a creek)	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