Karelian vs Carelian language

Karelian and Carelian language both are nouns.

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

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

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

Other synonyms of Karelian include Carelian, Karelian language.

Karelian (noun)	Carelian 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