border district vs dominion

border district and dominion both are nouns.

Word	Noun	Adjective	Verb	Adverb
border district	Yes	No	No	No
dominion	Yes	No	No	No

As nouns, dominion is a hypernym of border district; that is, dominion is a word with a broader meaning than border district:

border district: district consisting of the area on either side of a border or boundary of a country or an area
dominion: a region marked off for administrative or other purposes

Other hypernyms of border district include district, territorial dominion, territory.

border district (noun)	dominion (noun)
district consisting of the area on either side of a border or boundary of a country or an area	a region marked off for administrative or other purposes
	dominance or power through legal authority