ne'er-do-well vs no-account

ne'er-do-well and no-account both are nouns.

Word	Noun	Adjective	Verb	Adverb
ne'er-do-well	Yes	No	No	No
no-account	Yes	Yes	No	No

As nouns, ne'er-do-well and no-account are synonyms defined as:

Other synonyms of ne'er-do-well include goldbrick, good-for-naught, good-for-nothing, goof-off.

ne'er-do-well (noun)	no-account (noun)
an idle worthless person	an idle worthless person

ne'er-do-well (adjective)	no-account (adjective)
	without merit; of little or no value or use