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Proper nouns (also called proper names) are nouns representing unique entities (such as London or John), as distinguished from common nouns which describe a class of entities (such as city or person).
In English and most other languages that use the Latin alphabet, proper nouns are usually capitalised.
There's no such a thing as a 'white race', or a 'black race' or 'red' or whatever. There's a 'human' race that the entire population of the world belongs to, but to break it down beyond that needs to be done by distinctions other than race, such as nation, religion, etc...
Your definition of race is beside the point. The original poster was asking about the grammatical usage of the words.
And there is such a thing as a 'white race', or a 'black race' or 'red' or whatever. It may be a poor reflection of reality, but it is a concept in some people's worldview.
Since modern English has developed a fairly different grammar from these archaic languages, we find structural overlapping between nouns and those adjectives derived from nouns.
"Creole" is a general term.