motherland vs country of origin

motherland and country of origin both are nouns.

Word	Noun	Adjective	Verb	Adverb
motherland	Yes	No	No	No
country of origin	Yes	No	No	No

As nouns, motherland and country of origin are synonyms defined as:

Other synonyms of motherland include fatherland, homeland, mother country, native land.

motherland (noun)	country of origin (noun)
the country where you were born	the country where you were born