One who supports something; an advocate / One who makes a proposal or proposition. / (law) One who propounds a will for probate.

Making proposals; proposing.

plural of proponent

(transitive, Scotland) to propose or put forward for discussion or consideration

simple past tense and past participle of propone

Third-person singular simple present indicative form of propone

(US) Advocacy.

present participle of propone

plural of cdesign proponentsist

(Internet slang, humorous, derogatory) A creationist.