Oh ah... well... A servant is someone you pay to do a certain task. Or sometimes to do a series of task. Like... hmm... oh! Alright, you might pay a servant to tend to the fireplace and keep the kitchen clean. Or you might have a servant to cook your meals for the day, that's when they get called the cook. You may have a servant who tends to the whole house! But they are usually the most well paid, I think.

Does that make sense?