Republic of Angola vs African nation

Republic of Angola and African nation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Republic of Angola	Yes	No	No	No
African nation	Yes	No	No	No

Republic of Angola (noun)	African nation (noun)
a republic in southwestern Africa on the Atlantic Ocean; achieved independence from Portugal in 1975 and was the scene of civil war until 1990	any one of the countries occupying the African continent