borderland vs dominion

borderland and dominion both are nouns.

Word	Noun	Adjective	Verb	Adverb
borderland	Yes	No	No	No
dominion	Yes	No	No	No

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

borderland: 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 borderland include district, territorial dominion, territory.

borderland (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