DOEI vs government agency

DOEI and government agency both are nouns.

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

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

DOEI: an agency that collects political and economic and technical information about energy matters and makes the Department of Energy's technical and analytical expertise available to other members of the Intelligence Community
government agency: an administrative unit of government

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

DOEI (noun)	government agency (noun)
an agency that collects political and economic and technical information about energy matters and makes the Department of Energy's technical and analytical expertise available to other members of the Intelligence Community	an administrative unit of government