debar vs prevent

debar and prevent both are verbs.

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

As verbs, prevent is a hypernym of debar; that is, prevent is a word with a broader meaning than debar:

debar: prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off
prevent: keep from happening or arising; make impossible

Other hypernyms of debar include forbid, foreclose, forestall, preclude.

debar (verb)	prevent (verb)
prevent from entering; keep out	stop (someone or something) from doing something or being in a certain state
prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off	keep from happening or arising; make impossible
bar temporarily; from school, office, etc.