NUWC vs bureau

NUWC and bureau both are nouns.

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

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

NUWC: the agency that provides scientific and engineering and technical support for submarine and undersea warfare systems
bureau: an administrative unit of government

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

NUWC (noun)	bureau (noun)
the agency that provides scientific and engineering and technical support for submarine and undersea warfare systems	furniture with drawers for keeping clothes
	an administrative unit of government