nomad vs Khoisan

nomad and Khoisan both are nouns.

Word	Noun	Adjective	Verb	Adverb
nomad	Yes	No	No	No
Khoisan	Yes	No	No	No

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

nomad: a member of a people who have no permanent home but move about according to the seasons
Khoisan: nomadic hunters and gatherers who live in southern Africa

Other hyponyms of nomad include Bedouin, Beduin, Bushman, Hun, Saracen, Scythian.

nomad (noun)	Khoisan (noun)
a member of a people who have no permanent home but move about according to the seasons	a family of languages spoken in southern Africa
	nomadic hunters and gatherers who live in southern Africa