counterterrorism vs terrorist act

counterterrorism and terrorist act both are nouns.

Word	Noun	Adjective	Verb	Adverb
counterterrorism	Yes	No	No	No
terrorist act	Yes	No	No	No

counterterrorism (noun)	terrorist act (noun)
a strategy intended to prevent or counter terrorism	the calculated use of violence (or the threat of violence) against civilians in order to attain goals that are political or religious or ideological in nature; this is done through intimidation or coercion or instilling fear