counterattack vs counterstrike

counterattack is a noun but counterstrike is not a noun.

Word	Noun	Adjective	Verb	Adverb
counterattack	Yes	No	Yes	No
counterstrike	No	No	Yes	No

As verbs, counterattack and counterstrike are synonyms defined as:

counterattack (noun)	counterstrike (noun)
an attack by a defending force against an attacking enemy force in order to regain lost ground or cut off enemy advance units etc.
(chess) an attack that is intended to counter the opponent's advantage in another part of the board

counterattack (verb)	counterstrike (verb)
make a counterattack	make a counterattack