space agency vs bureau

space agency and bureau both are nouns.

Word	Noun	Adjective	Verb	Adverb
space agency	Yes	No	No	No
bureau	Yes	No	No	No

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

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

space agency (noun)	bureau (noun)
an organization dedicated to the exploration of space.	furniture with drawers for keeping clothes
	an administrative unit of government