General:
* Associate: This is a general term for someone you work with, often in a professional setting.
* Teammate: This emphasizes the collaborative aspect of working together, particularly in a team environment.
* Fellow: This is a slightly more formal term that emphasizes shared profession or interest.
More specific:
* Collaborator: This highlights the joint effort and shared responsibility in a project or task.
* Compeer: This implies a similar level of expertise or status.
* Aide: This refers to someone who assists or supports another individual.
* Partner: This can be used for a more formal business partnership, or a close working relationship.
* Associate: This is a general term for someone you work with, often in a professional setting.
Informal:
* Buddy: This is a casual term for a close friend or colleague.
* Workmate: This is a more informal term for a coworker.
The best word to use will depend on the specific situation and the relationship between the individuals involved.