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)guerrilla, guerilla, irregular, insurgenta member of an irregular armed force that fights a stronger force by sabotage and harassment

Adjectives

(s)insurgent, seditious, subversivein opposition to a civil authority or government