A device that controls amount of light admitted (synset 102730066)
hypernym: regulator - any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
A natural opening in something (synset 109223909)
hypernym: hole - an opening into or through somethinghyponym:
An man-made opening;
Usually small (synset 102729941)hypernym: opening - a vacant or unobstructed space that is man-made
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