inept vs incompetent

inept is not a noun while incompetent is a noun.

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

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

inept (adjective)	incompetent (adjective)
generally incompetent and ineffectual	not qualified or suited for a purpose
not elegant or graceful in expression	legally not qualified or sufficient
revealing lack of perceptiveness or judgment or finesse	not doing a good job
	not meeting requirements
	showing lack of skill or aptitude