The top row of this grid (photos 1-3) are the casing of the camera. They are the outer portion of the camera designed to keep sun and other light out of the inside of the camera (where the film is located). They also protect the inner parts of the camera.
Photo #4 of the grid (2nd row down on the left) is the lens of the camera. It bends the light entering the camera in one direction. This causes the light to converge at a point to form an image.
Photo #5 of the grid (2nd row down on the right) is the flash circuit, and photo #6 (3rd row on the left) is the flash. The flash adds the necessary amount of light to a subject where it is dark. The flash circuit, made up of a battery and an electrical circuit, produces the flash of light.
Photo #7 (3rd row on the right) is the film. The film collects the light reflected off the surface of a subject to preserve an image.
Photo #8 (4th row on the left) is the shutter. It opens and closes between the lens and film to control how much light is let in, on to the film.
Photo #9 (4th row on the right) is the gas discharge tube. This conducts an electrical current by moving electrons from one electrode to another to cause them to produce visible light (or the flash).