forefend vs forestall

forefend and forestall both are verbs.

Word	Noun	Adjective	Verb	Adverb
forefend	No	No	Yes	No
forestall	No	No	Yes	No

As verbs, forestall is a hypernym of forefend; that is, forestall is a word with a broader meaning than forefend:

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

Other hypernyms of forefend include forbid, foreclose, preclude, prevent.

forefend (verb)	forestall (verb)
prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off	act in advance of; deal with ahead of time
	keep from happening or arising; make impossible