collaborator

noun
1
a person who works with another person to create or produce something such as a book
همکار, هم‌نویس, هم‌مولف, هم‌پدیدآور
2
a person who helps the enemy in a war, when they have taken control of the person’s country
همدست, همکار دشمن, خائن
Former collaborators are now facing public humiliation in the courts.