Synonyms and related words :
abysm, abyss, alcove, arroyo, asylum, bay, bezel, bolt-hole, box canyon, breach, break, cache, canyon, carrel, cavity, chamfer, chap, chase, chasm, check, chimney, chink, cleft, cleuch, clough, col, concealment, corner, corrugation, coulee, couloir, cove, cover, covert, coverture, crack, crevasse, crevice, cubby, cubbyhole, cubicle, cut, cwm, dado, dark corner, defile, dell, den, dike, ditch, donga, draw, dugout, engraving, excavation, fault, fissure, flaw, flume, flute, fluting, foxhole, fracture, funk hole, furrow, gap, gape, gash, gorge, gouge, groove, gulch, gulf, gully, hideaway, hideout, hidey hole, hiding, hiding place, hole, incision, joint, kloof, lair, leak, microgroove, moat, niche, nook, notch, nullah, opening, oriel, pass, passage, rabbet, ravine, recess, refuge, rent, retreat, rifling, rift, rime, roomlet, ruck, rupture, rut, sanctuary, scissure, score, scratch, seam, secret place, slit, slot, snuggery, split, stash, streak, stria, striation, sulcation, sulcus, trench, undercovert, valley, void, wadi, well-worn groove, wrinkle