head off vs foreclose

head off and foreclose both are verbs.

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

As verbs, foreclose is a hypernym of head off; that is, foreclose is a word with a broader meaning than head off:

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

Other hypernyms of head off include forbid, forestall, preclude, prevent.

head off (verb)	foreclose (verb)
prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off	subject to foreclosing procedures; take away the right of mortgagors to redeem their mortgage
	keep from happening or arising; make impossible