From Longman Dictionary of Contemporary Englishraiderraid‧er /ˈreɪdə $ -ər/ noun [countable] someone who goes into a place and steals things an armed raider Masked raiders carried out a bank robbery today.
Examples from the Corpus
raider• Armed raiders have struck at least six times in the past year.• Harry's great merit was that, once he had been given the ball, he was a speedy and direct raider.• Throughout the centuries, the monks of Clonmacnoise had suffered from raiders sailing up the Shannon to plunder the monastic city.• Detectives are hunting three masked raiders who they believe will stop at nothing.• This brings us to the raiders of 1009-12.• Schoolboy James was hit in the mouth as he struggled with the raiders.• It is a dark and brooding pine forest thick with raiders, bandits, and Chaos warbands. 