穴 （ケツ） ass, arse, buttocks, rear, end, acupuncture point, hole, notch

穴隙 （ケツゲキ） crevice, aperture

横穴 （ヨコアナ） cave, tunnel, tunnel tomb (Kofun period)

経穴 （ケイケツ） acupuncture point

穴 （あな） hole, opening, orifice, perforation, pit, hollow, cavity, hole (e.g. in the ground), burrow, den, lair, holt, hole, deficit, shortage, (financial) hole, loss, gap (left by a missing employee, team member, etc.), vacancy, opening, flaw, fault, defect, weak point, hole (in a theory, plan, etc.), loophole, good place not many people know about, well-kept secret, upset victory (with a large payoff), long shot, dark horse, (partitioned) box (type of floor seating in a traditional Japanese theatre), hiding place, hideout

穴埋め （あなうめ） filling (up) a hole, filling in (for a gap, vacancy, etc.), stopgap, filler (e.g. article), making up (for a loss, damage, etc.), covering (a deficit), compensation, cloze deletion (test format)

風穴 （かざあな） air hole, windhole, air vent, deep cave from which cold wind blows

横穴 （よこあな） cave, tunnel, tunnel tomb (Kofun period)