Flaw, Fontanel, Foramen, Fracture, Furrow, Gash, Gill, Glen, Gorge, Groove, Grove, Gulf, Gully, Halt, Hiatus, Hole, Hollow, Incision, Inconsistency, Inlet, Interim, Intermission, Interruption, Interval, Joint, Kloof, Lack, Lacuna, Leak, Lull, Moat, Need, Notch, Omission, Open, Opening, Orifice, Outage, Outlet, Pass, Passage, Passageway, Pause, Pore, Ravine, Recess, Rent, Respite, Rest, Rift, Rime, Rip, Rupture, Scale, Seam, Separation, Shortage, Slash, Slice, Slit, Slot, Space, Splinter, Split, Stoma, Stop, Suspension, Tear, Trench, Trough, Vale, Valley, Void, Wadi, Wait, Want, Yawn, Abyss, Aperture, Bottom, Bottoms, Breach, Break, Breakage, Broaching, Burst, Canyon, Cavity, Cessation, Chap, Chasm, Check, Chimney, Chink, Chip, Clearing, Cleavage, Cleave, Cleft, Clove, Col, Couloir, Crack, Cranny, Crevasse, Crevice, Cut, Dale, Defect, Deficiency, Deficit, Defile, Delay, Dell, Difference, Dingle, Disagreement, Disclosure, Discontinuity, Discrepancy, Disparity, Disruption, Distance, Distinction, Ditch, Divergence, Division, Donga, Draw, Excavation, Fault, Fissure, Fistula