MCIA vs government agency

MCIA and government agency both are nouns.

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

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

MCIA: an agency of the United States Marine Corps that provides responsive and broad intelligence support for the worldwide Marine Corps organization
government agency: an administrative unit of government

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

MCIA (noun)	government agency (noun)
an agency of the United States Marine Corps that provides responsive and broad intelligence support for the worldwide Marine Corps organization	an administrative unit of government