guerrilla
noun
[ ɡəˈrɪlə ]
• a member of a small independent group taking part in irregular fighting, typically against larger regular forces.
• "this town fell to the guerrillas"
Similar:
freedom fighter,
underground fighter,
irregular soldier,
irregular,
resistance fighter,
member of the resistance,
partisan,
rebel,
radical,
revolutionary,
revolutionist,
terrorist,
Origin:
early 19th century (introduced during the Peninsular War): from Spanish, diminutive of guerra ‘war’.