Nouns

(n)insurgent, insurrectionist, freedom fighter, rebela person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions)
(n)maverick, rebelsomeone who exhibits great independence in thought and action

Verbs

(v)rebel, arise, rise, rise uptake part in a rebellion; renounce a former allegiance
(v)rebel, renegadebreak with established customs