border district vs marchland

border district and marchland both are nouns.

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

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

border district and marchland: 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 borderland, march.

border district (noun)	marchland (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