Chao Phraya vs Chao Phraya River

Chao Phraya and Chao Phraya River both are nouns.

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

As nouns, Chao Phraya and Chao Phraya River are synonyms defined as:

Chao Phraya and Chao Phraya River: 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

Chao Phraya (noun)	Chao Phraya 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 river in Thailand formed by the confluence of the Nan and Ping Rivers; flows southward past Bangkok and empties into the Gulf of Thailand