A pickguard (also known as scratchplate) is a piece of plastic or other (often laminated) material that is placed on the body of a guitar, mandolin or similar plucked string instrument. The main purpose of the pickguard is to protect the guitar's finish from being scratched by the guitar pick.
A prep cook is someone that assists the cook in preparing and serving of items on the menu. His/her job description involves various kitchen tasks like general cleaning, dish washing, and storing of food and other items in their proper positions.
A catering coordinator (or catering manager) typically oversees the catering operations of a restaurant, resort, or other food service business. If you work as a catering coordinator, you'll also use your sales and marketing skills to persuade new customers to order from your business. You might choose to work in a specific food service area, such as deli or dessert catering. Source: U.S. Bureau of Labor Statistics.