mother country vs native land

mother country and native land both are nouns.

Word	Noun	Adjective	Verb	Adverb
mother country	Yes	No	No	No
native land	Yes	No	No	No

As nouns, mother country and native land are synonyms defined as:

Other synonyms of mother country include country of origin, fatherland, homeland, motherland.

mother country (noun)	native land (noun)
the country where you were born	the country where you were born