Caucasian vs White race

Caucasian and White race both are nouns.

Word	Noun	Adjective	Verb	Adverb
Caucasian	Yes	Yes	No	No
White race	Yes	No	No	No

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

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