Russian vs Cheremiss

Russian and Cheremiss both are nouns.

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

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

Russian (noun)	Cheremiss (noun)
the Slavic language that is the official language of Russia	the Finnic language spoken by the Cheremis
a native or inhabitant of Russia	a member of a rural Finnish people living in eastern Russia

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