Rio Grande vs Rio Bravo

Rio Grande and Rio Bravo both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rio Grande	Yes	No	No	No
Rio Bravo	Yes	No	No	No

As nouns, Rio Grande and Rio Bravo are synonyms defined as:

Rio Grande and Rio Bravo: a North American river; boundary between the United States and Mexico; flows into Gulf of Mexico

Rio Grande (noun)	Rio Bravo (noun)
a North American river; boundary between the United States and Mexico; flows into Gulf of Mexico	a North American river; boundary between the United States and Mexico; flows into Gulf of Mexico