roamer vs clochard

roamer and clochard both are nouns.

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

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

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

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

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