counterterror vs counterterrorist

counterterror is not a noun while counterterrorist is a noun.

Word	Noun	Adjective	Verb	Adverb
counterterror	No	Yes	No	No
counterterrorist	Yes	Yes	No	No

As adjectives, counterterror and counterterrorist are synonyms defined as:

counterterror (noun)	counterterrorist (noun)
	someone who attempts to prevent terrorism

counterterror (adjective)	counterterrorist (adjective)
intended to prevent terrorism	intended to prevent terrorism