Abandon, Abyss, Adit, Alight, Aqueduct, Bank, Bar, Barrage, Barrier, Beg, Boom, Breach, Break, Breakwater, Buffer, Groin, Groove, Gulf, Gully, Gutter, Hide, Hole, Incision, Ingress, Jam, Jettison, Jetty, Jilt, Joint, Junk, Kennel, Kloof, Land, Leak, Light, Logjam, Mine, Moat, Mole, Mound, Notch, Occult, Open, Opening, Overshoot, Pancake, Parallel, Parapet, Pass, Passage, Passageway, Pleat, Portcullis, Rampart, Ravine, Reject, Remove, Rent, Rifle, Rift, Rime, Roadblock, Rupture, Rut, Sap, Score, Scrap, Scratch, Screen, Seam, Secrete, Shake, Skirt, Slit, Slot, Slough, Split, Streak, Trench, Trough, Tunnel, Upwind, Valley, Void, Wadi, Wall, Way, Weir, Work, Wrinkle, Bulkhead, Bulwark, Bunker, Bury, Cache, Canal, Canyon, Carve, Cashier, Cast, Cavity, Chamfer, Channel, Chap, Chasm, Check, Chimney, Chink, Chisel, Chuck, Circumvent, Cleave, Cleft, Cofferdam, Col, Conceal, Conduit, Couloir, Course, Cover, Crack, Cranny, Crevasse, Crevice, Crimp, Cut, Dado, Dam, Defile, Dell, Descend, Discard, Donga, Double, Downwind, Draw, Duct, Dugout, Dump, Earthwork, Egress, Eliminate, Elude, Embankment, Engrave, Ensconce, Entrance, Entrenchment, Escape, Evade, Excavation, Exit, Fault, Fence, Fissure, Flaw, Flute, Foxhole, Fracture, Furrow, Gallery, Gap, Gape, Gash, Gate, Gorge, Gouge