Other hyponyms of crusader include
abolitionist,
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,
hippy,
hipster,
freedom fighter,
insurgent,
insurrectionist,
rebel,
activist,
militant,
non-resistant,
passive resister,
preservationist,
Utopian.