good-for-nothing vs good-for-naught

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

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

As adjectives, good-for-nothing and good-for-naught are synonyms defined as:

good-for-nothing and good-for-naught: without merit; of little or no value or use

Other synonyms of good-for-nothing include meritless, no-account, no-count, no-good, sorry.

As nouns, good-for-nothing and good-for-naught are synonyms defined as:

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

good-for-nothing (noun)	good-for-naught (noun)
an idle worthless person	an idle worthless person

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