Bantu-speaking vs Bantu

Bantu-speaking is not a noun while Bantu is a noun.

Word	Noun	Adjective	Verb	Adverb
Bantu-speaking	No	Yes	No	No
Bantu	Yes	Yes	No	No

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

Bantu-speaking (adjective)	Bantu (adjective)
of or relating to people who speak Bantu	of or relating to the African people who speak one of the Bantoid languages or to their culture
able to communicate in Bantu