Other hyponyms of meliorist include
emancipationist,
birth-control campaigner,
birth-control reformer,
Chartist,
civil rights activist,
civil rights leader,
civil rights worker,
demonstrator,
protester,
dry,
prohibitionist,
conservationist,
environmentalist,
feminist,
libber,
women's liberationist,
women's rightist,
flower child,
hippie,
hippy,
hipster,
freedom fighter,
insurgent,
insurrectionist,
rebel,
activist,
militant,
non-resistant,
passive resister,
preservationist,
Utopian.