Republic of the Congo vs Africa

Republic of the Congo and Africa both are nouns.

Word	Noun	Adjective	Verb	Adverb
Republic of the Congo	Yes	No	No	No
Africa	Yes	No	No	No

Republic of the Congo (noun)	Africa (noun)
a republic in west-central Africa; achieved independence from France in 1960	the second largest continent; located to the south of Europe and bordered to the west by the South Atlantic and to the east by the Indian Ocean