brunette vs someone

brunette and someone both are nouns.

Word	Noun	Adjective	Verb	Adverb
brunette	Yes	Yes	No	No
someone	Yes	No	No	No

As nouns, someone is a hypernym of brunette; that is, someone is a word with a broader meaning than brunette:

brunette: a person with dark (brown) hair
someone: a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

Other hypernyms of brunette include individual, mortal, person, somebody, soul.

brunette (noun)	someone (noun)
a person with dark (brown) hair	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

brunette (adjective)	someone (adjective)
marked by dark or relatively dark pigmentation of hair or skin or eyes