Black African vs caffre

Black African and caffre both are nouns.

Word	Noun	Adjective	Verb	Adverb
Black African	Yes	No	No	No
caffre	Yes	No	No	No

As nouns, caffre is a hyponym of Black African; that is, caffre is a word with a more specific, narrower meaning than Black African:

Other hyponyms of Black African include caffer, kaffir, kafir.

Black African (noun)	caffre (noun)
an African who is Black	an offensive and insulting term for any Black African