BJA vs federal agency

BJA and federal agency both are nouns.

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

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

BJA: the bureau in the Department of Justice that assists local criminal justice systems to reduce or prevent crime and violence and drug abuse
federal agency: an administrative unit of government

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

BJA (noun)	federal agency (noun)
the bureau in the Department of Justice that assists local criminal justice systems to reduce or prevent crime and violence and drug abuse	an administrative unit of government