roamer vs vagrant

roamer and vagrant both are nouns.

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

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

roamer: someone who leads a wandering unsettled life
vagrant: a wanderer who has no established residence or visible means of support

Other hyponyms of roamer include nomad, clochard, drifter, floater, vagabond.

roamer (noun)	vagrant (noun)
someone who leads a wandering unsettled life	a wanderer who has no established residence or visible means of support

roamer (adjective)	vagrant (adjective)
	continually changing especially as from one abode or occupation to another