Department of Defense Laboratory System vs Defense Department

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

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

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