INS vs bureau

INS and bureau both are nouns.

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

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

INS: a former agency in the Department of Justice that enforces laws and regulations for the admission of foreign-born persons to the United States
bureau: an administrative unit of government

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

INS (noun)	bureau (noun)
a former agency in the Department of Justice that enforces laws and regulations for the admission of foreign-born persons to the United States	furniture with drawers for keeping clothes
	an administrative unit of government