variants:
or guerilla
Definition of guerrilla
(Entry 1 of 2)
: a person who engages in irregular warfare especially as a member of an independent unit carrying out harassment and sabotage (see sabotage sense 2)
Guerrillas controlled half the country.
guerrilla
adjectiveDefinition of guerrilla (Entry 2 of 2)
: of, relating to, or suggestive of guerrillas especially in being aggressive, radical, or unconventional
guerrilla warfare
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Merriam-Webster unabridged
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Time Traveler for guerrilla
The first known use of guerrilla was in 1809
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