nomad vs Bushman

nomad and Bushman both are nouns.

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

As nouns, Bushman is a hyponym of nomad; that is, Bushman 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
Bushman: nomadic hunters and gatherers who live in southern Africa

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

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