The synonym is "opposite"
Some synonyms for agitator are disruptor, dissident, malcontent, anarchist, advocate.Some antonyms for agitator are conciliator, peacemaker, conservative, moderate, arbitrator.
Synonyms: bold, courageous, daring, fearless Antonyms: timid, meek, cowardly.
Antonyms: antidote, cure, tonic Synonyms: toxin, venom, miasma
synonyms: original, pure, unpolluted, natural antonyms: impure