nullifier vs exponent

nullifier and exponent both are nouns.

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

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

nullifier: an advocate of nullification; someone who believes that a state can resist federal laws
exponent: a person who pleads for a cause or propounds an idea

Other hypernyms of nullifier include advocate, advocator, proponent.

nullifier (noun)	exponent (noun)
an advocate of nullification; someone who believes that a state can resist federal laws	a mathematical notation indicating the number of times a quantity is multiplied by itself
an official who can invalidate or nullify	a person who pleads for a cause or propounds an idea
	someone who expounds and interprets or explains