agency vs government agency

agency and government agency both are nouns.

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

As nouns, agency and government agency are synonyms defined as:

Other synonyms of agency include authority, bureau, federal agency, office.

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