Defense Department vs Department of Defense Laboratory System

Defense Department and Department of Defense Laboratory System both are nouns.

Word	Noun	Adjective	Verb	Adverb
Defense Department	Yes	No	No	No
Department of Defense Laboratory System	Yes	No	No	No

Defense Department (noun)	Department of Defense Laboratory System (noun)
the federal department responsible for safeguarding national security of the United States; created in 1947	a defense laboratory that provides essential services in fundamental science for national security and environmental protection and provides technologies that contribute to industrial competitiveness