U. S. Coast Guard vs agency

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

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

As nouns, agency is a hypernym of U. S. Coast Guard; that is, agency 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
agency: an administrative unit of government

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

U. S. Coast Guard (noun)	agency (noun)
an agency of the Department of Transportation responsible for patrolling shores and facilitating nautical commerce	to have the ability to produce a particular effect or achieve an end
	an administrative unit of government
	a business or organization that provides a particular service, especially the mediation of transactions between two parties
	the state of serving as an official and authorized delegate or agent
	the state of being in action or exerting power