countermine vs counteract

countermine is a noun but counteract is not a noun.

Word	Noun	Adjective	Verb	Adverb
countermine	Yes	No	Yes	No
counteract	No	No	Yes	No

As verbs, countermine and counteract are synonyms defined as:

countermine and counteract: destroy property or hinder normal operations

Other synonyms of countermine include sabotage, subvert, undermine, weaken.

countermine (noun)	counteract (noun)
(military) a tunnel dug to defeat similar activities by the enemy

countermine (verb)	counteract (verb)
destroy enemy mines with one's own mines	act in opposition to
destroy property or hinder normal operations	destroy property or hinder normal operations
	oppose or check by a counteraction
	oppose and mitigate the effects of by contrary actions