agency vs administrative unit

agency and administrative unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
agency	Yes	No	No	No
administrative unit	Yes	No	No	No

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

Other hypernyms of agency include administrative body.

agency (noun)	administrative unit (noun)
to have the ability to produce a particular effect or achieve an end	a unit with administrative responsibilities
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