aperture

nouns

a device that controls amount of light admitted
aperture
is a part of
equipment for taking photographs (usually consisting of a lightproof box with a lens at one end and light-sensitive film at the other)
camera, photographic camera
is a part of
a magnifier of images of distant objects
scope, telescope
is a type of (narrower)
any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
regulator
a natural opening in something
aperture
is a part of
the organ of sight
eye, oculus, optic
is a type of (narrower)
an opening into or through something
hole
an man-made opening; usually small
aperture
is a type of (narrower)
a vacant or unobstructed space that is man-made
"they left a small opening for the cat at the bottom of the door"
opening