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, ventilator
落とし穴【おとしあな】
pitfall, trap, pit
墓穴【ぼけつ】
grave (pit)
横穴【よこあな】
cave, tunnel, tunnel tomb (Kofun period)
抜け穴【ぬけあな】
secret passage, underground passage, loophole, hole one can go through, opening
大穴【おおあな】
large hole, big deficit, heavy losses, long-shot win (in horse racing, etc.), big winnings (on a long shot), a killing (made from a bet)
洞穴【ほらあな】
cave, cavern, den, grotto
穴熊【あなぐま】
badger, Eurasian badger (Meles meles), defensive opening for shogi
毛穴【けあな】
pore (of the skin)
穴場【あなば】
good place not many people know about, great little-known spot, good out-of-the-way place, well-kept secret, hidden gem of a place, betting booth (at a racecourse)