Bantu vs Bantu-speaking

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

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

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