border district vs borderland

border district and borderland both are nouns.

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

As nouns, border district and borderland are synonyms defined as:

border district and borderland: district consisting of the area on either side of a border or boundary of a country or an area

Other synonyms of border district include march, marchland.

border district (noun)	borderland (noun)
district consisting of the area on either side of a border or boundary of a country or an area	district consisting of the area on either side of a border or boundary of a country or an area