supporter vs proponent

supporter and proponent both are nouns.

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

As nouns, proponent is a hypernym of supporter; that is, proponent is a word with a broader meaning than supporter:

Other hypernyms of supporter include advocate, advocator, exponent.

supporter (noun)	proponent (noun)
a band (usually elastic) worn around the leg to hold up a stocking (or around the arm to hold up a sleeve)	a person who pleads for a cause or propounds an idea
a support for the genitals worn by men engaging in strenuous exercise
a person who backs a politician or a team etc.
a person who contributes to the fulfillment of a need or furtherance of an effort or purpose
someone who supports or champions something