穴

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)