The term 'SOUR SERVER' is a job description for someone who works in the hospitality industry. The crossword solutions for this term are BAR, which stands for Bartender. A bartender is responsible for preparing and serving alcoholic beverages to customers in a BAR or restaurant. They must also be knowledgeable about different types of drinks and be able to mix them correctly. Additionally, they must be able to interact with customers in a friendly and professional manner.