Step 1: Understand the role of a supervisor.
A supervisor plays a vital role in guiding workers, ensuring that tasks are completed efficiently, and providing support in the workplace.
Step 2: Evaluate the options.
- A supervisor is a guide, helping workers with their tasks, giving advice, and ensuring they are working towards the goals of the company.
- While a supervisor can be a friend or philosopher in some cases, their primary role is to guide and manage workers.
Step 3: Conclude.
The most appropriate answer is that a supervisor is a guide for the workers.
Final Answer:
\[
\boxed{\text{Guide}}
\]