white woman vs woman

white woman and woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
white woman	Yes	No	No	No
woman	Yes	No	No	No

As nouns, woman is a hypernym of white woman; that is, woman is a word with a broader meaning than white woman:

Other hypernyms of white woman include Caucasian, White, White person, adult female.

white woman (noun)	woman (noun)
a woman who is White	women as a class
	an adult female person (as opposed to a man)
	a female person who plays a significant role (wife or mistress or girlfriend) in the life of a particular man