The term TEST AREA can be broken down into two crossword solutions: LAB, which is a 3 letter word, and TEST AREA. A laboratory, or LAB, is a room or building that is equipped for scientific research, experiments, and measurements. It is typically used by scientists, engineers, and technicians to conduct tests, analyze data, and perform experiments. TEST AREA is an area that is set aside for testing purposes. It is usually used to evaluate the performance of a product or system, or to test new products or technologies.