Swazi vs African

Swazi and African both are nouns.

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

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

Swazi: a member of a southeast African people living in Swaziland and adjacent areas
African: a native or inhabitant of Africa

Swazi (noun)	African (noun)
a Bantu language closely related to Zulu, with about three million speakers	a native or inhabitant of Africa
a member of a southeast African people living in Swaziland and adjacent areas

Swazi (adjective)	African (adjective)
of or relating to or characteristic of Swaziland or its people or their language	of or relating to the nations of Africa or their peoples