Angolan vs African

Angolan and African both are nouns.

Word	Noun	Adjective	Verb	Adverb
Angolan	Yes	Yes	No	No
African	Yes	Yes	No	No

As nouns, African is a hypernym of Angolan; that is, African is a word with a broader meaning than Angolan:

Angolan (noun)	African (noun)
a native or inhabitant of Angola	a native or inhabitant of Africa

Angolan (adjective)	African (adjective)
of or relating to or characteristic of Angola or its people	of or relating to the nations of Africa or their peoples