ineffective vs incompetent

ineffective is not a noun while incompetent is a noun.

Word	Noun	Adjective	Verb	Adverb
ineffective	No	Yes	No	No
incompetent	Yes	Yes	No	No

ineffective (noun)	incompetent (noun)
	someone who is not competent to take effective action

ineffective (adjective)	incompetent (adjective)
not producing an intended effect	not qualified or suited for a purpose
lacking in power or forcefulness	legally not qualified or sufficient
lacking the ability or skill to perform effectively; inadequate	not doing a good job
	not meeting requirements
	showing lack of skill or aptitude