homeland vs mother country

homeland and mother country both are nouns.

Word	Noun	Adjective	Verb	Adverb
homeland	Yes	No	No	No
mother country	Yes	No	No	No

As nouns, homeland and mother country are synonyms defined as:

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

homeland (noun)	mother country (noun)
the country where you were born	the country where you were born