good-for-naught vs goof-off

good-for-naught and goof-off both are nouns.

Word	Noun	Adjective	Verb	Adverb
good-for-naught	Yes	Yes	No	No
goof-off	Yes	No	No	No

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

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

good-for-naught (noun)	goof-off (noun)
an idle worthless person	an idle worthless person

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