disallow vs debar

disallow and debar both are verbs.

Word	Noun	Adjective	Verb	Adverb
disallow	No	No	Yes	No
debar	No	No	Yes	No

As verbs, debar is a hyponym of disallow; that is, debar is a word with a more specific, narrower meaning than disallow:

Other hyponyms of disallow include ban, bar, exclude, enjoin, criminalise, criminalize, illegalise, illegalize, outlaw.

disallow (verb)	debar (verb)
command against	prevent from entering; keep out
	prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off
	bar temporarily; from school, office, etc.