Mordva vs Russian

Mordva and Russian both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mordva	Yes	No	No	No
Russian	Yes	Yes	No	No

As nouns, Russian is a hypernym of Mordva; that is, Russian is a word with a broader meaning than Mordva:

Mordva: a member of the agricultural people living in the central Volga provinces of European Russia
Russian: a native or inhabitant of Russia

Mordva (noun)	Russian (noun)
the Finnic language spoken by the Mordvinians	the Slavic language that is the official language of Russia
a member of the agricultural people living in the central Volga provinces of European Russia	a native or inhabitant of Russia

Mordva (adjective)	Russian (adjective)
	of or pertaining to or characteristic of Russia or its people or culture or language