ne'er-do-well vs goof-off

ne'er-do-well and goof-off both are nouns.

Word	Noun	Adjective	Verb	Adverb
ne'er-do-well	Yes	No	No	No
goof-off	Yes	No	No	No

As nouns, ne'er-do-well and goof-off are synonyms defined as:

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

ne'er-do-well (noun)	goof-off (noun)
an idle worthless person	an idle worthless person