Chao Phraya River vs Chao Phraya

Chao Phraya River and Chao Phraya both are nouns.

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

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

Chao Phraya River and Chao Phraya: 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 River (noun)	Chao Phraya (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