Abyss, Aperture, Assign, Assignment, Attribute, Attributive, Breach, Break, Broaching, Canyon, Cavity, Channel, Chap, Chasm, Check, Chimney, Chink, Clearing, Cleave, Cleft, Col, Complement, Yawn, Couloir, Crack, Cranny, Crevasse, Crevice, Cut, Cutting, Defile, Dell, Depression, Disclosure, Ditch, Donga, Draw, Excavation, Fault, Filler, Fissure, Fistula, Fit, Flaw, Fontanel, Foramen, Fracture, Function, Furrow, Gap, Gape, Gash, Gorge, Groove, Gulf, Gully, Hiatus, Hole, Hollow, Incision, Inlet, Interval, Job, Joint, Kloof, Lacuna, Leak, Levels, Moat, Modifier, Niche, Notch, Object, Open, Opening, Orifice, Outlet, Pass, Passage, Passageway, Place, Pore, Position, Predicate, Qualifier, Ranks, Ravine, Rent, Rift, Rime, Rupture, Schedule, Seam, Slit, Space, Split, Spot, Stoma, Strata, Structure, Subject, Syntax, Trench, Vacancy, Valley, Void, Wadi