good-for-nothing vs layabout

good-for-nothing and layabout both are nouns.

Word	Noun	Adjective	Verb	Adverb
good-for-nothing	Yes	Yes	No	No
layabout	Yes	No	No	No

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

Other hypernyms of good-for-nothing include bum, do-nothing, idler, loafer.

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

good-for-nothing (adjective)	layabout (adjective)
without merit; of little or no value or use