SynonymDefinitionAntonym.com - English Synonym Dictionary

A person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions)

Someone who exhibits great independence in thought and action

`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

Take part in a rebellion; renounce a former allegiance

Break with established customs