Caucasian race vs White people

Caucasian race and White people both are nouns.

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

As nouns, Caucasian race and White people are synonyms defined as:

Other synonyms of Caucasian race include Caucasoid race, White race.

Caucasian race (noun)	White people (noun)
a light-skinned race	a light-skinned race