A person who works jointly on an activity or project.

A person who assists an enemy force occupying their country.

गद्दार

English Usage: During the war, he was labeled a collaborator for working with the occupying forces.

Hindi Usage: युद्ध के दौरान, उसे कब्जे वाली सेना के साथ काम करने के लिए एक गद्दार करार दिया गया।