palace vs authorities

palace and authorities both are nouns.

Word	Noun	Adjective	Verb	Adverb
palace	Yes	No	No	No
authorities	Yes	No	No	No

As nouns, authorities is a hypernym of palace; that is, authorities is a word with a broader meaning than palace:

palace: the governing group of a kingdom
authorities: the organization that is the governing authority of a political unit

Other hypernyms of palace include government, regime.

palace (noun)	authorities (noun)
official residence of an exalted person (as a sovereign)	the organization that is the governing authority of a political unit
a large and stately mansion
a large ornate exhibition hall
the governing group of a kingdom