DISA vs government agency

DISA and government agency both are nouns.

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

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

DISA: a combat support agency in the Department of Defense responsible for developing and operating and supporting information systems to serve the needs of the President and the Secretary of Defense and the Joint Chiefs of Staff
government agency: an administrative unit of government

Other hypernyms of DISA include agency, authority, bureau, federal agency, office.

DISA (noun)	government agency (noun)
a combat support agency in the Department of Defense responsible for developing and operating and supporting information systems to serve the needs of the President and the Secretary of Defense and the Joint Chiefs of Staff	an administrative unit of government