bureaucracy vs officialdom

bureaucracy and officialdom both are nouns.

Word	Noun	Adjective	Verb	Adverb
bureaucracy	Yes	No	No	No
officialdom	Yes	No	No	No

As nouns, officialdom is a hypernym of bureaucracy; that is, officialdom is a word with a broader meaning than bureaucracy:

Other hypernyms of bureaucracy include government officials.

bureaucracy (noun)	officialdom (noun)
nonelective government officials	people elected or appointed to administer a government
a government that is administered primarily by bureaus that are staffed with nonelective officials
any organization in which action is obstructed by insistence on unnecessary procedures and red tape