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.
The head cook runs the show. The executive chef, sometimes called the head cook or the chef de cuisine, is the one responsible for running the food preparation in a kitchen. He or she takes on much more of a management role than anyone else on the kitchen staff. Executive chefs are usually employed by large restaurants, hotels, private country clubs and even cruise lines.