Bantu vs Watusi

Bantu and Watusi both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bantu	Yes	Yes	No	No
Watusi	Yes	No	No	No

As nouns, Watusi is a hyponym of Bantu; that is, Watusi is a word with a more specific, narrower meaning than Bantu:

Bantu: a member of any of a large number of linguistically related peoples of Central and South Africa
Watusi: a member of a Bantu speaking people living in Rwanda and Burundi

Other hyponyms of Bantu include Herero, Hutu, Chiluba, Luba, Sotho, Batswana, Bechuana, Tswana, Tutsi, Watutsi, Shona.

Bantu (noun)	Watusi (noun)
a family of languages widely spoken in the southern half of the African continent	a member of a Bantu speaking people living in Rwanda and Burundi
a member of any of a large number of linguistically related peoples of Central and South Africa

Bantu (adjective)	Watusi (adjective)
of or relating to the African people who speak one of the Bantoid languages or to their culture