NCDC vs bureau

NCDC and bureau both are nouns.

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

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

NCDC: the part of NOAA that maintains the world's largest active archive of weather data
bureau: an administrative unit of government

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

NCDC (noun)	bureau (noun)
the part of NOAA that maintains the world's largest active archive of weather data	furniture with drawers for keeping clothes
	an administrative unit of government