Caucasian vs Caucasoid

Caucasian is a noun but Caucasoid is not a noun.

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

As adjectives, Caucasian and Caucasoid are synonyms defined as:

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