counterterrorist vs doer

counterterrorist and doer both are nouns.

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

As nouns, doer is a hypernym of counterterrorist; that is, doer is a word with a broader meaning than counterterrorist:

Other hypernyms of counterterrorist include actor, worker.

counterterrorist (noun)	doer (noun)
someone who attempts to prevent terrorism	a person who acts and gets things done

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