insurgent

Adjective

• in opposition to a civil authority or government

Noun

• a member of an irregular armed force that fights a stronger force by sabotage and harassment

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

Related words

• Synonyms: 
  seditious , subversive , guerrilla , guerilla , irregular , insurrectionist , freedom fighter , rebel