DS vs Bureau of Diplomatic Security

DS and Bureau of Diplomatic Security both are nouns.

Word	Noun	Adjective	Verb	Adverb
DS	Yes	No	No	No
Bureau of Diplomatic Security	Yes	No	No	No

As nouns, DS and Bureau of Diplomatic Security are synonyms defined as:

DS and Bureau of Diplomatic Security: the bureau in the State Department that is responsible for the security of diplomats and embassies overseas

DS (noun)	Bureau of Diplomatic Security (noun)
an honorary degree in science	the bureau in the State Department that is responsible for the security of diplomats and embassies overseas
the bureau in the State Department that is responsible for the security of diplomats and embassies overseas