Synonyms to unstopping

aperture, access, aisle, alley, ambulatory, arcade, artery, avenue, bore, breach, break, broaching, cavity, channel, chasm, check, chink, clearing, cleft, cloister, colonnade, communication, conduit, connection, corridor, covered way, crack, crevice, cut, defile, disclosure, discontinuity, exit, fenestra, ferry, fissure, fistula, fontanel, foramen, ford, gallery, gap, gape, gash, gat, gulf, hiatus, hole, hollow, inlet, interchange, intersection, interstice, interval, junction, lacuna, lane, laying open, leak, opening, opening up, orifice, outlet, overpass, pass, passage, passageway, perforation, pinhole, pore, portico, prick, puncture, railroad tunnel, rupture, slash, slit, slot, space, split, stoma, throwing open, traject, trajet, tunnel, uncorking, underpass, vent, yawn, abysm, abyss, alveolation, alveolus, antrum, armpit, arroyo, basin, booth, bowl, box, box canyon, canyon, cell, cellule, chamber, chap, chimney, cleuch, clough, col, compartment, concave, concavity, coulee, couloir, cranny, crater, crevasse, crib, crypt, cup,