debar vs preclude

debar and preclude both are verbs.

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

As verbs, preclude is a hypernym of debar; that is, preclude 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
preclude: keep from happening or arising; make impossible

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

debar (verb)	preclude (verb)
prevent from entering; keep out	keep from happening or arising; make impossible
prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off	make impossible, especially beforehand
bar temporarily; from school, office, etc.