Defense Department vs National Security Agency

Defense Department and National Security Agency both are nouns.

Word	Noun	Adjective	Verb	Adverb
Defense Department	Yes	No	No	No
National Security Agency	Yes	No	No	No

Defense Department (noun)	National Security Agency (noun)
the federal department responsible for safeguarding national security of the United States; created in 1947	the United States cryptologic organization that coordinates and directs highly specialized activities to protect United States information systems and to produce foreign intelligence information