Naval Special Warfare vs bureau

Naval Special Warfare and bureau both are nouns.

Word	Noun	Adjective	Verb	Adverb
Naval Special Warfare	Yes	No	No	No
bureau	Yes	No	No	No

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

Naval Special Warfare: the agency that provides units to conduct unconventional and counter-guerilla warfare
bureau: an administrative unit of government

Other hypernyms of Naval Special Warfare include agency, authority, federal agency, government agency, office.

Naval Special Warfare (noun)	bureau (noun)
the agency that provides units to conduct unconventional and counter-guerilla warfare	furniture with drawers for keeping clothes
	an administrative unit of government