Chadian vs African

Chadian and African both are nouns.

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

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

Chadian (noun)	African (noun)
a native or inhabitant of Chad	a native or inhabitant of Africa

Chadian (adjective)	African (adjective)
of or relating to or characteristic of the Republic of Chad or its people or language	of or relating to the nations of Africa or their peoples