구멍

Etymology
From pre-Middle Korean, the modern form preserving the velar nature of the final consonant. First appeared in the seventeenth century as a distinctively Modern Korean form, displacing the Middle Korean form, which still survives in some dialects.

Noun

 * 1) hole, aperture, opening
 * 2)  defect, loophole, blind point
 * 3)  loss, deficit
 * 1)  defect, loophole, blind point
 * 2)  loss, deficit