executive agency vs agency

executive agency and agency both are nouns.

Word	Noun	Adjective	Verb	Adverb
executive agency	Yes	No	No	No
agency	Yes	No	No	No

As nouns, agency is a hypernym of executive agency; that is, agency is a word with a broader meaning than executive agency:

Other hypernyms of executive agency include authority, bureau, federal agency, government agency, office.

executive agency (noun)	agency (noun)
an agency of the executive branch of government	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