solid

hallow, tocsin, specious, trite, meaningless, illusory, muffled, vacuous, rubbery, flimsy, insubstantial, emptily, resonant, shrill, contrived, insincere, raptorial, platitudinous, laughable, platitudes, implausible, fatuous, hackneyed, true, disingenuous, pyrrhic, featherlike, hyperbolic, hortatory, unconvincing, squishy, clanks, nonsensical, tympanic, bedspring, flaccid, incongruous, inefficacious, sententious, pathetic, concrete, knell, sandpapered, jellied, rings, preposterous, flatteries, lathed, tinny, worthless, unbendable, persiflage, bland, knifelike, vague, hokey, grandiose, wishful thinking, falseness, cryptic, deaden, puny, brownism, superficial, stygian, boilerplate, echo, absurd, vapid, phantasmal, sanctimonious, meshy, grandiloquent, resonating, pattering, unbent, cylindrical, mere, unvoiced, counterweighted, unilluminated, simplistic, chimerical, fallacious, rocklike, disinteresting, muzzy, fluting, distend, rattly, fabricated, prosaic, repetitiously, anodyne, unuttered, shaped, decayed, contentless, crenelated, potemkin village, hickory nut, baldfaced, hollows, ravine, cove, hillock, cavern, glade, gully, lagoon, alcove, crevice, bottoms, knoll, meadow, mound, pond, cave, gulch, sandbank, valley, ditch, hollowed, insulated, petrified, cylindric, earthed, tapered, walled, jointed, steel, thinwalled, diameter, fluted, lucite, broken, deadened, grooved, sawn

burrow, cavern out, cavity, chuckhole, core, dell, dig, dig out, dingle, draw in, drive, gopher hole, gouge, groove, hole, pit, pothole, rabbit burrow, rabbit hole, rout, scallop, scollop, scoop out, suck in, trench, tunnel, undermine, wormhole

., acetabulum, agaricus arvensis, aix sponsa, allium cepa, allium schoenoprasum, amphoric, annulet, antrum, archaeopteryx, archaeopteryx lithographica, archeopteryx, armpit, axilla, axillary cavity, axillary fossa, bamboo, barrel, beehive, bell, belly, bodily cavity, bones, boom, boom out, bovid, box beam, box girder, brake drum, bryales, bubble, calamus, calculus, cannular, cannulation, cannulisation, cannulization, cantharellus floccosus, canulation, canulisation, canulization, castanets, cave, cavern, cavern out, cave in, cavity, cavity resonator, cavum, cecropia peltata, centesis, chive, chives, cive, clappers, concretion, condenser, core, corythosaur, corythosaurus, cotyloid cavity, crown saw, dell, dendrocalamus giganteus, dimple, dingle, drum, ectasia, ectasis, endoscopy, false, fang, fiddle, finger cymbals, floccose chanterelle, fundus, furrow, geode, giant bamboo, glove doll, glove puppet, graminaceous plant, gramineous plant, groove, hand puppet, heart, hive, hollowness, hollow out, horsetail, horse mushroom, hypodermic needle, imbauba, incisura, incisure, insubstantially, introitus, intubation, iron maiden, kettle, kettle hole, kyo-chiku, lavage, lecanopteris, maraca, membranophone, needle biopsy, onion, onion plant, order bryales, pate a choux, ping-pong, ping-pong ball, pipe, pit viper, plop, plunk, pocket, polyp, popover, pouf paste, powder flask, powder horn, protoavis, puff batter, pump, puppet, quill, reed, resonating chamber, resonator, roundel, rush, rut, schnittlaugh, scoop, scoop out, sepulchral, shaft, slough, snake wood, socket, spasm, strangulate, subsidence, summer duck, syconium, table tennis, thunk, ticker, toggle bolt, tragopogon dubius, trojan horse, trumpet-wood, trumpetwood, trumpet tree, tube, tube-shaped structure, tubing, tubular, tympan, undermine, uterus, valve, violin, viper, water hole, waveguide, wave guide, wiffle, wiffle ball, womb, wooden horse, wood duck, wood widgeon, yellow salsify

depression, empty, enclosed space, natural depression, remove, take, take away, vale

cavernous, core out, deep-set, excavate, fistular, fistulate, fistulous, holler, recessed, reverberant, ringing, sunken