DISA vs federal agency

DISA and federal agency both are nouns.

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

As nouns, federal agency is a hypernym of DISA; that is, federal 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
federal agency: an administrative unit of government

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

DISA (noun)	federal 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