head off vs debar

head off and debar both are verbs.

Word	Noun	Adjective	Verb	Adverb
head off	No	No	Yes	No
debar	No	No	Yes	No

As verbs, head off and debar are synonyms defined as:

head off and debar: prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off

Other synonyms of head off include avert, avoid, deflect, fend off, forefend, forfend, obviate, stave off, ward off.

head off (verb)	debar (verb)
prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off	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.