NIST vs bureau

NIST and bureau both are nouns.

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

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

NIST: an agency in the Technology Administration that makes measurements and sets standards as needed by industry or government programs
bureau: an administrative unit of government

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

NIST (noun)	bureau (noun)
an agency in the Technology Administration that makes measurements and sets standards as needed by industry or government programs	furniture with drawers for keeping clothes
	an administrative unit of government