Congo vs Congo River

Congo and Congo River both are nouns.

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

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

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

Other synonyms of Congo include Zaire River.

Congo (noun)	Congo River (noun)
a republic in central Africa; achieved independence from Belgium in 1960	a major African river (one of the world's longest); flows through Congo into the South Atlantic
a republic in west-central Africa; achieved independence from France in 1960
a major African river (one of the world's longest); flows through Congo into the South Atlantic