DoS vs Foreign Service

DoS and Foreign Service both are nouns.

Word	Noun	Adjective	Verb	Adverb
DoS	Yes	No	No	No
Foreign Service	Yes	No	No	No

DoS (noun)	Foreign Service (noun)
the federal department in the United States that sets and maintains foreign policies	the part of the State Department that supplies diplomats for the United States embassies and consulates around the world