CDC vs federal agency

CDC and federal agency both are nouns.

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

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

CDC: a federal agency in the Department of Health and Human Services; located in Atlanta; investigates and diagnoses and tries to control or prevent diseases (especially new and unusual diseases)
federal agency: an administrative unit of government

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

CDC (noun)	federal agency (noun)
a federal agency in the Department of Health and Human Services; located in Atlanta; investigates and diagnoses and tries to control or prevent diseases (especially new and unusual diseases)	an administrative unit of government