Workmate (noun)

A colleague or fellow worker.

Origin:

The word workmate is a combination of work and mate which is derived from the old english word mæg, meaning "friend" or "associate".

Examples:

1. He was a workmate, who I had known for many years.
2. I had a great working relationship with my workmates.
3. He was a workmate, who was always willing to lend a helping hand.
4. I was able to rely on my workmates to get the job done.
5. We used to have lunch together with my workmates.