Mauritian vs aboriginal

Mauritian and aboriginal both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mauritian	Yes	Yes	No	No
aboriginal	Yes	Yes	No	No

As nouns, aboriginal is a hypernym of Mauritian; that is, aboriginal is a word with a broader meaning than Mauritian:

Other hypernyms of Mauritian include aborigine, indigen, indigene, native.

Mauritian (noun)	aboriginal (noun)
a native or inhabitant of Mauritius	an indigenous person who was born in a particular place

Mauritian (adjective)	aboriginal (adjective)
of or related to the island or country of Mauritius or its inhabitants	characteristic of or relating to people inhabiting a region from the beginning
	having existed from the beginning; in an earliest or original stage or state