U. S. Coast Guard vs bureau

U. S. Coast Guard and bureau both are nouns.

Word	Noun	Adjective	Verb	Adverb
U. S. Coast Guard	Yes	No	No	No
bureau	Yes	No	No	No

As nouns, bureau is a hypernym of U. S. Coast Guard; that is, bureau is a word with a broader meaning than U. S. Coast Guard:

U. S. Coast Guard: an agency of the Department of Transportation responsible for patrolling shores and facilitating nautical commerce
bureau: an administrative unit of government

Other hypernyms of U. S. Coast Guard include coastguard, agency, authority, federal agency, government agency, office.

U. S. Coast Guard (noun)	bureau (noun)
an agency of the Department of Transportation responsible for patrolling shores and facilitating nautical commerce	furniture with drawers for keeping clothes
	an administrative unit of government