supremacist vs exponent

supremacist and exponent both are nouns.

Word	Noun	Adjective	Verb	Adverb
supremacist	Yes	No	No	No
exponent	Yes	No	No	No

As nouns, exponent is a hypernym of supremacist; that is, exponent is a word with a broader meaning than supremacist:

supremacist: a person who advocates the supremacy of some particular group or racial group over all others
exponent: a person who pleads for a cause or propounds an idea

Other hypernyms of supremacist include advocate, advocator, proponent.

supremacist (noun)	exponent (noun)
a person who advocates the supremacy of some particular group or racial group over all others	a mathematical notation indicating the number of times a quantity is multiplied by itself
	a person who pleads for a cause or propounds an idea
	someone who expounds and interprets or explains