staircase, stairway, walkway, spiral staircase, entryway, archway, doorway, tunnel, entranceway, cavern, corridors, stairwell, entrance, cavelike, hatchway, thoroughfare, alcoves, artery, waterway, courtyard, breezeways, breezeway, labyrinth, canal, hallway, travelator, fanlight, skylit, alleyway, sarcophaguses, maze, throughway, skylight, lazarette, stairs, gangway, warren, oculus, underpass, vestibules, trapdoor, conduit, chokepoint, gaillard cut, colonnade, egress, arches, cistern, antechamber, clerestory, compartment, french doors, iliac artery, mona passage, drainpipe, dormer window, porthole, footpath, airlocks, foyer, ginnel, battlement, mousehole, bab el mandeb, subarachnoid space, northwest passage, strait, pathway, blockhouse, crossway, boulevard, porticoes, pilaster, wormhole, rathskeller, atrium, nave, mudroom, grotto, tidal basin, khyber pass, guardhouses, drawbridge, millrace, piazza, footbridge, cantilevering, linen closet, chainlink fence, louvres, tomb, promontories, gates, soakaway, kiva, embarkment, crossbeams, stile, transept, promenade, dumbwaiter, stalactite, passageways, corridor, vestibule, walkways, roadway, cellar, ramp, stair, verandah, hallways

aisle, arcade, areaway, birth canal, channel, drift, duct, esophagus, fauces, fistula, gallery, gorge, gullet, heading, meatus, oesophagus, opening, orifice, root canal, shaft, shunt, sinus, sinusoid

., aisle, arcade, arch, arched, archway, areaway, catheter, corridor, covered bridge, drift, gallery, gangway, gate, hatchway, heading, meatus, mineshaft, obstructed, opening, patent, scuttle, shaft, slide valve, stenosis, stricture, tunnel, turnstile, walk-through

anatomical structure, bodily structure, body structure, complex body part, passage, structure