Synonyms and related words :
abysm, abyss, arroyo, box canyon, breach, break, canyon, cavity, chap, chasm, check, chimney corner, chink, chute, cleft, cleuch, clough, col, coulee, couloir, country rock, crack, cranny, crevasse, crevice, cut, cwm, defile, dell, deposit, dike, ditch, donga, draw, excavation, fault, fender, fire screen, fireboard, fireguard, fireplace, fireside, fissure, flaw, flue, flue pipe, flume, fracture, fumarole, funnel, furrow, gangue, gap, gape, gash, gorge, groove, gulch, gulf, gully, hearth, hearthstone, hob, hole, hub, incision, ingle, inglenook, ingleside, joint, kloof, leak, lode, lodestuff, matrix, mineral deposit, moat, notch, nullah, opening, ore bed, pass, passage, pay dirt, ravine, rent, rift, rime, rupture, scissure, seam, shoot, slit, slot, smokehole, smokeshaft, smokestack, split, stack, stock, stovepipe, trench, valley, vein, void, wadi