Madagascar vs African nation

Madagascar and African nation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Madagascar	Yes	No	No	No
African nation	Yes	No	No	No

Madagascar (noun)	African nation (noun)
a republic on the island of Madagascar; achieved independence from France in 1960	any one of the countries occupying the African continent
an island in the Indian Ocean off the southeastern coast of Africa; the 4th largest island in the world