Indian vs Oriya

Indian and Oriya both are nouns.

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

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

Indian (noun)	Oriya (noun)
any of the languages spoken by Amerindians	a Magadhan language that is spoken by the Oriya and is the official language of the Indian state of Orissa
a native or inhabitant of India	a member of a people in India living in Orissa and neighboring areas

Indian (adjective)	Oriya (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