- Opening (Substantives), hole, foramen, perforation, window, eye, eyelet, keyhole, loop-hole, porthole, mouse-hole, pigeon-hole, eye of a needle, pin-hole, puncture.
- Closure (Substantives), occlusion, blockade, shutting up, filling up, plugging, sealing, obstruction, impassableness, blocking up, obstipation, constipation, blind alley, blind corner, cul-de-sac, impasse, cècum.
- Perforator (Substantives), borer, auger, gimlet, stylet, drill, wimble, awl, bradawl, scoop, terrier, corkscrew, dibble, trepan, probe, bodkin, needle, stiletto, lancet, punch, spike, bit, gouge, fleam.
- Stopper (Substantives), stopple, plug, cork, bung, spigot, spike, spile, stopcock, tap, stop-gap, rammer, ramrod, piston, wad, wadding, tompion, stuffing, tourniquet.
Channel, gutter, trench, ditch, dike, moat, fosse, trough, kennel, chamfer, ravine (see 198), fluting.
(Verbs). To furrow, etc., flute, plough.
(Adjectives). Furrowed, etc., ribbed, striated, striate, sulcated, fluted, canaliculate, bisulcate, trisulcate, etc., corduroy, corrugated.
Aperture, hiatus, yawning, oscitancy, dehiscence, patefaction, see Interval 198.
Orifice, inlet, intake, outlet, mouth, throat, muzzle, gullet, weasand, nozzle, portal, porch, gate, gateway, door, embouchure, doorway, exit, vomitory, arcade.
Channel 350, passage, pass, tube, pipe, vessel, tubule, canal, thoroughfare, gut, fistula, ajutage, tap, chimney, flue, funnel, gully, tunnel, main, adit, pit, shaft, gallery, alley, aisle, glade, vista, bore, mine, calibre, pore, follicle, porosity, porousness, lacuna.
Sieve, cullender, colander, strainer, tamis, riddle, screen, honeycomb.
Apertion, perforation, piercing, boring, mining, terebration, drilling, etc., impalement, pertusion, puncture, acupuncture, penetration 302.
(Verbs). To open, gape, yawn.
To perforate, lay open, pierce, empierce, bore, mine, drill, scoop out, canalise, tunnel, transpierce, transfix, enfilade, rake, impale, spike, spear, gore, stab, pink, stick, prick, puncture, riddle, punch, jab; to stave in.
(Phrase). To cut a passage through.
To uncover, unrip, stave in.
(Adjectives). Open, pierced, perforated, etc., perforate, wide open, ajar, unclosed, unstopped, patulous, gaping, yawning, patent.
Tubular, tubulate, tubuliform, cannular, fistulous, fistular, fistulate, pervious, permeable, foraminous, porous, follicular, cribriform, honeycombed, infundibular, windowed, fenestrated.
Imperforation, imperviousness, impermeability, imporosity.
(Verbs). To close, occlude, plug, block up, fill up, blockade, obstruct, stop, bung up, seal, plumb, cork up, shut up, choke, throttle, ram down, dam up, cram, stuff up.
(Adjectives). Closed, shut, unopened, occluded, etc., impervious, imperforate, cècal, impassable, invious, pathless, untrodden, unpierced, unventilated, impermeable, imporous, operculated, air-tight, hermetic.
(Phrase). Hermetically sealed.
(Verbs). To spike, gouge, scoop, punch, lance.