Tunisian vs African

Tunisian and African both are nouns.

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

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

Tunisian (noun)	African (noun)
a native or inhabitant of Tunisia	a native or inhabitant of Africa

Tunisian (adjective)	African (adjective)
of or relating to Tunisia or its inhabitants	of or relating to the nations of Africa or their peoples
of or relating to the city of Tunis or its residents