구멍 (kumeong) means “hole” | MotiTan Korean Dictionary

More examples

창문 틈의 구멍을 천으로 막았어요.chang mun teu mui ku meong eul cheo neu ro ma ga sseo yo

I plugged the opening around the window with a cloth.

An opening through a surface or inside a thing that lets the inside show or allows passage.

틈teum: A narrow open space between two things or parts of the same thing.
구덩이kudeongi: A large, deep hollow made in the ground.

물건의 표면이나 내부에 뚫려서 속이 보이거나 통하는 자리.mul geo nui pyo myeo ni na nae bu e ttul lyeo seo so gi po i geo na tong ha neun cha ri

The word's origin is uncertain, but its established use centers on an opening in a thing, making the image of a visible passage a useful memory aid.

In TOPIK passages, the surrounding verb often shows whether the opening formed accidentally or was made deliberately.