Rebel, Reb, Johnny Reb, Johnny, greyback -- (`Johnny' was applied as a nickname for Confederate soldiers by the Federal soldiers in the American Civil War; `greyback' derived from their grey Confederate uniforms)
insurgent, insurrectionist, freedom fighter, rebel -- (a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions))
maverick, rebel -- (someone who exhibits great independence in thought and action)
Overview of verb rebel
The verb rebel has 2 senses
rebel, arise, rise, rise up -- (take part in a rebellion; renounce a former allegiance)
rebel, renegade -- (break with established customs)