THESAURUS
excavation
abysm, abyss, arroyo, avulsion, box canyon, breach, break, bringing to light, burrow, canyon, casual discovery, catching, cavity, chance discovery, chap, chasm, check, chimney, chink, cleft, cleuch, clough, col, coulee, couloir, crack, cranny, crater, crevasse, crevice, cut, cutting out, cwm, deepening, defile, dell, depression, deracination, detection, determination, determining, dig, digging, diggings, dike, disclosure, discovery, disentanglement, distinguishment, ditch, donga, draw, drawing, drawing out, dredging, drilling, engraving, enucleation, eradication, espial, evolvement, evulsion, excision, exhumation, exposure, expression, exsection, extirpation, extraction, extrication, fault, find, finding, finding out, fissure, flaw, flume, fracture, furrow, gap, gape, gash, gorge, groove, gulch, gulf, gully, hole, hollow, incision, indentation, invention, joint, kloof, leak, locating, location, lowering, lucky strike, mine, mining, moat, notch, nullah, opening, pass, passage, pit, pressing out, probing, pulling, quarry, quarrying, ravine, recognition, rediscovery, removal, rent, revelation, rift, rime, ripping out, rupture, scissure, seam, serendipity, shaft, sinkage, sinking, slit, slot, split, spotting, squeezing out, strike, treasure trove, trench, trough, trouvaille, trove, tunnel, tunneling, uncovering, unearthing, unrooting, uprooting, valley, void, wadi, well, withdrawal, workings, wresting out
ROGET THESAURUS
excavation
Concavity
N
concavity, depression, dip, hollow, hollowness, indentation, intaglio, cavity, dent, dint, dimple, follicle, pit, sinus, alveolus, lacuna,
excavation, strip mine, trough, honeycomb, cup, basin, crater, punch bowl, cell, socket, valley, vale, dale, dell, dingle, combe, bottom, slade, strath, glade, grove, glen, cave, cavern, cove, grot, grotto, alcove, cul-de- sac, gully, arch, bay, excavator, sapper, miner, honeycomb (sponge), depressed, alveolate, calathiform, cup-shaped, dishing, favaginous, faveolate, favose, scyphiform, scyphose, concave, hollow, stove in, retiring, retreating, cavernous, porous, infundibul, infundibular, infundibuliform, funnel shaped, bell shaped, campaniform, capsular, vaulted, arched.