countervail vs offset

countervail is not a noun while offset is a noun.

Word	Noun	Adjective	Verb	Adverb
countervail	No	No	Yes	No
offset	Yes	No	Yes	No

As verbs, offset is a hypernym of countervail; that is, offset is a word with a broader meaning than countervail:

Other hypernyms of countervail include cancel, set off.

As verbs, countervail and offset are synonyms defined as:

countervail (noun)	offset (noun)
	structure where a wall or building narrows abruptly
	a plate makes an inked impression on a rubber-blanketed cylinder, which in turn transfers it to the paper
	a natural consequence of development
	a horizontal branch from the base of plant that produces new plants from buds at its tips
	a compensating equivalent
	the time at which something is supposed to begin

countervail (verb)	offset (verb)
oppose and mitigate the effects of by contrary actions	produce by offset printing
compensate for or counterbalance	create an offset in
	cause (printed matter) to transfer or smear onto another surface
	make up for
	compensate for or counterbalance