robusta coffee vs Rio Nunez coffee

robusta coffee and Rio Nunez coffee both are nouns.

Word	Noun	Adjective	Verb	Adverb
robusta coffee	Yes	No	No	No
Rio Nunez coffee	Yes	No	No	No

As nouns, robusta coffee and Rio Nunez coffee are synonyms defined as:

robusta coffee and Rio Nunez coffee: native to West Africa but grown in Java and elsewhere; resistant to coffee rust

Other synonyms of robusta coffee include Coffea canephora, Coffea robusta.

robusta coffee (noun)	Rio Nunez coffee (noun)
native to West Africa but grown in Java and elsewhere; resistant to coffee rust	native to West Africa but grown in Java and elsewhere; resistant to coffee rust