A servant was a person who worked for another one and cared for the well-being including serving foods and beverages.
Some Troglytes worked as servants and sentinels for the Stratos city-dwellers. (TOS: "The Cloud Minders")
While being in a Q recreation of Sherwood Forest, Vash, portraying Maid Marian, had a servant. (TNG: "Qpid")
Kamala considered herself as a servant to the person she belonged to. (TNG: "The Perfect Mate")
The Hupyrian Maihar'du was the servant, bodyguard, and food taster of the Ferengi Grand Nagus Zek. (DS9: "The Nagus", "Prophet Motive")
The Tigan family had a personal servant in their house at the New Sydney colony. (DS9: "Prodigal Daughter")