countervail vs neutralize

countervail and neutralize both are verbs.

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

As verbs, countervail and neutralize are synonyms defined as:

countervail and neutralize: oppose and mitigate the effects of by contrary actions

Other synonyms of countervail include counteract, counterbalance.

countervail (verb)	neutralize (verb)
oppose and mitigate the effects of by contrary actions	make chemically neutral
compensate for or counterbalance	make ineffective by counterbalancing the effect of
	make incapable of military action
	get rid of (someone who may be a threat) by killing
	make politically neutral and thus inoffensive
	oppose and mitigate the effects of by contrary actions