terrorist act vs CTC

terrorist act and CTC both are nouns.

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

terrorist act (noun)	CTC (noun)
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	an agency that helps the Director of Central Intelligence coordinate counterterrorist efforts in order to preempt and disrupt and defeat terrorist activities at the earliest possible stage