Hook, Hurdle, Impediment, Imperfection, Inadequacy, Incisor, Infirmity, Jag, Joker, Kink, Land, Lasso, Ledges, Mesh, Molar, Nail, Net, Noose, Objection, Obstacle, Obstruction, Obstructive, Peak, Peg, Pinch, Pitfall, Premolar, Problem, Projection, Quicksands, Rake, Rift, Rip, Rocks, Rope, Rub, Sack, Sandbank, Sands, Sawtooth, Shallows, Shoals, Shortcoming, Snare, Spear, Spire, Sprocket, Spur, Steeple, Stricture, Taint, Take, Tangle, Tear, Tooth, Trap, Traverse, Tusk, Undercurrent, Weakness, Bag, Bar, Blemish, Block, Blockade, Bottleneck, Brake, Bug, Canine, Catch, Clog, Cog, Comb, Complication, Cordon, Crack, Crag, Crimp, Crown, Crux, Curb, Curtain, Cutter, Defect, Defection, Deficiency, Dent, Dentition, Deterrent, Difficulty, Drag, Drawback, Ensnare, Entangle, Entrap, Eyetooth, Failing, Failure, Fang, Fault, Flaw, Foible, Foul, Frailty, Grinder, Hamper, Harpoon, Harrow, Hazard, Hindrance, Hitch, Hole