collaborator
noun
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an associate in an activity or endeavor or sphere of common interestβThe assist maker and the goal scorer are were collaborators.βcooperatorpartnerpardner
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someone who collaborates with an enemy occupying forceβThe main collaborators were executed after the war.βcollaborationistquisling
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someone who assists in a plotβAll of the collaborator were arrested after the ring leader gave them up.βconfederate