good-for-naught vs goldbrick

good-for-naught and goldbrick both are nouns.

Word	Noun	Adjective	Verb	Adverb
good-for-naught	Yes	Yes	No	No
goldbrick	Yes	No	Yes	No

As nouns, good-for-naught and goldbrick are synonyms defined as:

Other synonyms of good-for-naught include good-for-nothing, goof-off, ne'er-do-well, no-account.

good-for-naught (noun)	goldbrick (noun)
an idle worthless person	anything that is supposed to be valuable but turns out to be worthless
	a brick-shaped block that looks like gold but is not
	an idle worthless person
	a soldier who performs his duties without proper care or effort

good-for-naught (adjective)	goldbrick (adjective)
without merit; of little or no value or use

good-for-naught (verb)	goldbrick (verb)
	avoid (one's assigned duties)
	deprive of by deceit