goldbrick vs good-for-naught

goldbrick and good-for-naught both are nouns.

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

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

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

goldbrick (noun)	good-for-naught (noun)
anything that is supposed to be valuable but turns out to be worthless	an idle worthless person
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

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

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