Convulsionist :: Convulsionist (n.) One who has convulsions; esp., one of a body of fanatics in France, early in the eighteenth century, who went into convulsions under the influence of religious emotion; as, the Convulsionists of St. Medard..
Convulsive :: Convulsive (a.) Producing, or attended with, convulsions or spasms; characterized by convulsions; convulsionary..