collaborator
[noun]
Synonyms:
- co-worker, associate, colleague, confederate, partner, team-mate
- traitor, fraternizer, quisling, turncoat

[TahlilGaran] English Synonym Dictionary ▲

col‧lab‧o‧ra‧tor /kəˈlæbəreɪtə $ -ər/ noun [countable]

1. someone who helps their country’s enemies, for example by giving them information, when the enemy has taken control of their country ⇒ collaborate, collaboration:
Their job was to identify enemy collaborators.

2. someone who works with other people or groups in order to achieve something, especially in science or art ⇒ collaborate, collaboration:
collaborators on a biography of Dickens

[TahlilGaran] Dictionary of Contemporary English ▲