Definition: a militant reformer
Similar words: reformer, reformist, meliorist, social reformer, crusader
Definition: a disputant who advocates reform
Synonyms: activist, activistic
Definition: advocating or engaged in activism
Similar words: active
Definition: disposed to take action or effectuate change
Usage: a director who takes an active interest in corporate operations; an active antagonism; he was active in drawing attention to their grievances