A person working in the same place with another

A. Enemy

B. Colleague

C. Assistant

D. Contemporary

Answer: Option B

Solution(By Examveda Team)

One word substitute is Colleague.

Enemy: a person who is actively opposed or hostile to someone or something.
Colleague: a person with whom one works in a profession or business.
Assistant: a person who ranks below a senior person.
Contemporary: living or occurring at the same time.