Oppone(v. t.) To oppose.
Opponency(n.) The act of opening an academical disputation; the proposition of objections to a tenet, as an exercise for a degree.
Opponent(a.) Situated in front; opposite; hence, opposing; adverse; antagonistic.
Opponent(n.) One who opposes; an adversary; an antagonist; a foe.
Opponent(n.) One who opposes in a disputation, argument, or other verbal controversy; specifically, one who attacks some theirs or proposition, in distinction from the respondent, or defendant, who maintains it.
Words within opponency