good-for-nothing vs no-good

good-for-nothing is a noun but no-good is not a noun.

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

As adjectives, good-for-nothing and no-good are synonyms defined as:

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

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

good-for-nothing (noun)	no-good (noun)
an idle worthless person

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