Caucasian vs Caucasic

Caucasian is a noun but Caucasic is not a noun.

Word	Noun	Adjective	Verb	Adverb
Caucasian	Yes	Yes	No	No
Caucasic	No	Yes	No	No

As adjectives, Caucasian and Caucasic are synonyms defined as:

Caucasian and Caucasic: of or relating to the geographical region of Caucasia

Caucasian (noun)	Caucasic (noun)
a number of languages spoken in the Caucasus that are unrelated to languages spoken elsewhere
a person of European descent with a light-skinned or pale complexion

Caucasian (adjective)	Caucasic (adjective)
of or relating to the geographical region of Caucasia	of or relating to the geographical region of Caucasia
of or relating to Caucasian people