good-for-naught vs do-nothing

good-for-naught and do-nothing both are nouns.

Word	Noun	Adjective	Verb	Adverb
good-for-naught	Yes	Yes	No	No
do-nothing	Yes	Yes	No	No

As nouns, do-nothing is a hypernym of good-for-naught; that is, do-nothing is a word with a broader meaning than good-for-naught:

Other hypernyms of good-for-naught include bum, idler, layabout, loafer.

good-for-naught (noun)	do-nothing (noun)
an idle worthless person	person who does no work

good-for-naught (adjective)	do-nothing (adjective)
without merit; of little or no value or use	characterized by inability or unwillingness to work toward a goal or assume responsibility