FDA vs bureau

FDA and bureau both are nouns.

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

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

FDA: a federal agency in the Department of Health and Human Services established to regulate the release of new foods and health-related products
bureau: an administrative unit of government

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

FDA (noun)	bureau (noun)
a federal agency in the Department of Health and Human Services established to regulate the release of new foods and health-related products	furniture with drawers for keeping clothes
	an administrative unit of government