Congo River vs Zaire River

Congo River and Zaire River both are nouns.

Word	Noun	Adjective	Verb	Adverb
Congo River	Yes	No	No	No
Zaire River	Yes	No	No	No

As nouns, Congo River and Zaire River are synonyms defined as:

Congo River and Zaire River: a major African river (one of the world's longest); flows through Congo into the South Atlantic

Other synonyms of Congo River include Congo.

Congo River (noun)	Zaire River (noun)
a major African river (one of the world's longest); flows through Congo into the South Atlantic	a major African river (one of the world's longest); flows through Congo into the South Atlantic