exponent vs proponent

exponent and proponent both are nouns.

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

As nouns, exponent and proponent are synonyms defined as:

exponent and proponent: a person who pleads for a cause or propounds an idea

Other synonyms of exponent include advocate, advocator.

exponent (noun)	proponent (noun)
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
a person who pleads for a cause or propounds an idea
someone who expounds and interprets or explains