DS vs bureau

DS and bureau both are nouns.

Word	Noun	Adjective	Verb	Adverb
DS	Yes	No	No	No
bureau	Yes	No	No	No

As nouns, bureau is a hypernym of DS; that is, bureau is a word with a broader meaning than DS:

DS: the bureau in the State Department that is responsible for the security of diplomats and embassies overseas
bureau: an administrative unit of government

Other hypernyms of DS include agency, authority, federal agency, government agency, office.

DS (noun)	bureau (noun)
an honorary degree in science	furniture with drawers for keeping clothes
the bureau in the State Department that is responsible for the security of diplomats and embassies overseas	an administrative unit of government