incompetent vs slouch

incompetent and slouch both are nouns.

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

As nouns, slouch is a hyponym of incompetent; that is, slouch is a word with a more specific, narrower meaning than incompetent:

Other hyponyms of incompetent include blunderer, botcher, bumbler, bungler, butcher, fuckup, fumbler, sad sack, stumbler.

incompetent (noun)	slouch (noun)
someone who is not competent to take effective action	a stooping carriage in standing and walking
	an incompetent person; usually used in negative constructions

incompetent (adjective)	slouch (adjective)
not qualified or suited for a purpose
legally not qualified or sufficient
not doing a good job
not meeting requirements
showing lack of skill or aptitude

incompetent (verb)	slouch (verb)
	walk slovenly
	assume a drooping posture or carriage