The answer to the crossword question “Peeper that makes no sound” is EYE. The eye is an organ that allows us to see and perceive the world around us. It is a silent observer, making no sound as it takes in visual information. The eye is a complex structure that includes the cornea, iris, pupil, lens, retina, and optic nerve. It works by focusing light onto the retina, which then sends signals to the brain to create the images we see. While the eye may not make any sound, it is a vital part of our sensory system and plays a crucial role in our daily lives.