CTC vs bureau

CTC and bureau both are nouns.

Word	Noun	Adjective	Verb	Adverb
CTC	Yes	No	No	No
bureau	Yes	No	No	No

As nouns, bureau is a hypernym of CTC; that is, bureau is a word with a broader meaning than CTC:

CTC: 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
bureau: an administrative unit of government

Other hypernyms of CTC include agency, authority, federal agency, government agency, office.

CTC (noun)	bureau (noun)
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	furniture with drawers for keeping clothes
	an administrative unit of government