nomad vs roamer

nomad and roamer both are nouns.

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

As nouns, roamer is a hypernym of nomad; that is, roamer is a word with a broader meaning than nomad:

nomad: a member of a people who have no permanent home but move about according to the seasons
roamer: someone who leads a wandering unsettled life

Other hypernyms of nomad include bird of passage, rover, wanderer.

nomad (noun)	roamer (noun)
a member of a people who have no permanent home but move about according to the seasons	someone who leads a wandering unsettled life