Indian vs Maratha

Indian and Maratha both are nouns.

Word	Noun	Adjective	Verb	Adverb
Indian	Yes	Yes	No	No
Maratha	Yes	No	No	No

As nouns, Maratha is a hyponym of Indian; that is, Maratha is a word with a more specific, narrower meaning than Indian:

Indian (noun)	Maratha (noun)
any of the languages spoken by Amerindians	a member of a people of India living in Maharashtra
a native or inhabitant of India

Indian (adjective)	Maratha (adjective)
of or relating to or characteristic of India or the East Indies or their peoples or languages or cultures
of or pertaining to Native Americans or their culture or languages