PROPONENT
advocate, advocator, proponent, exponent
(noun) a person who pleads for a cause or propounds an idea
Source: WordNet® 3.1
Etymology
Noun
proponent (plural proponents)
One who supports something; an advocate
One who makes a proposal or proposition.
(legal) One who propounds a will for probate.
Synonyms
• exponent
Antonyms
• detractor
• opponent
Adjective
proponent (not comparable)
Making proposals; proposing.
Source: Wiktionary
Pro*po"nent, a. Etym: [L. proponens, p. pr.]
Definition: Making proposals; proposing.
Pro*po"nent, n.
1. One who makes a proposal, or lays down a proposition. Dryden.
2. (Law)
Definition: The propounder of a thing.
Source: Webster’s Unabridged Dictionary 1913 Edition