Defense Intelligence Agency vs Defense Department

Defense Intelligence Agency and Defense Department both are nouns.

Word	Noun	Adjective	Verb	Adverb
Defense Intelligence Agency	Yes	No	No	No
Defense Department	Yes	No	No	No

Defense Intelligence Agency (noun)	Defense Department (noun)
an intelligence agency of the United States in the Department of Defense; is responsible for providing intelligence in support of military planning and operations and weapons acquisition	the federal department responsible for safeguarding national security of the United States; created in 1947