African nation vs Republic of Angola

African nation and Republic of Angola both are nouns.

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

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