Karelian vs Karelian language

Karelian and Karelian language both are nouns.

Word	Noun	Adjective	Verb	Adverb
Karelian	Yes	No	No	No
Karelian language	Yes	No	No	No

As nouns, Karelian and Karelian language are synonyms defined as:

Karelian and Karelian language: a Finnic language spoken by the people of Karelia

Other synonyms of Karelian include Carelian, Carelian language.

Karelian (noun)	Karelian language (noun)
a Finnic language spoken by the people of Karelia	a Finnic language spoken by the people of Karelia
a member of the Finnish people living in Karelia in northwestern European Russia