[{"Bold_text": "noun", "List Items": ["a person who works or cooperates with another on something; a coauthor, coproducer, etc.:She is currently at work on a new recording project with longtime collaborator Greg Timson.", "a person who cooperates with an enemy nation or force, especially with an enemy occupying one’s country:Her book gives a detailed account of postwar Poland’s legal retribution against its Nazi collaborators."]}]