NGA vs bureau

NGA and bureau both are nouns.

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

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

NGA: a combat support agency that provides geographic intelligence in support of national security
bureau: an administrative unit of government

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

NGA (noun)	bureau (noun)
a combat support agency that provides geographic intelligence in support of national security	furniture with drawers for keeping clothes
	an administrative unit of government