no-good vs no-count

no-good and no-count both are adjectives.

Word	Noun	Adjective	Verb	Adverb
no-good	No	Yes	No	No
no-count	No	Yes	No	No

As adjectives, no-good and no-count are synonyms defined as:

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

no-good (adjective)	no-count (adjective)
returned for lack of funds	without merit; of little or no value or use
without merit; of little or no value or use