Breach, break, puncture, crack, wound, dent, pothole, passage,
aperture, slit, slot, tunnel, channel, cavity, ravine, hollow, cliff, gorge,
hole, hiatus, hinge, pipe, funnel, manhole, loophole, concavity,
notching, dent, furrow, pit, scratch, trench, cave, burrow, deepening,
mouth, cavity, receptacle, container, dwelling, cellar, cell, furnace
