Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class II. Words Relating to Space
Section III. Form
3. Superficial Form

260. Opening.

   NOUN:OPENING, aperture, apertness [archaic]; hiation [rare], yawning, oscitance or oscitancy, dehiscence, patefaction [obs.], pandiculation; chasm (interval) [See Interval].
  outlet, inlet; vent, venthole, blowhole, airhole, spiracle; vomitory [Rom. arch.]; embouchure; orifice, mouth, sucker, muzzle, throat, gullet, weasand, wizen [dial.], nozzle; placket.
  WINDOW, casement; embrasure, abatjour [F.]; light; skylight, fanlight; lattice; bay window, bow window, oriel, dormer; lantern.
  PORTAL, porch, gate, ostiary [obs.], postern, wicket, trapdoor, hatch, door; arcade; cellarway, driveway, gateway, doorway, hatchway, gangway; lich gate or lych gate [archaic].
  WAY, path [See Method]; thoroughfare; channel, gully; passage, passageway.
  TUBE, pipe, main; water pipe [See Conduit]; air pipe [See Air Pipe]; vessel, tubule, canal, gut, fistula; ajutage or adjutage; ostium; smokestack; chimney, flue, tap, funnel.
  TUNNEL, mine, pit, adit, drift, shaft; gallery.
  ALLEY, lane, mall, aisle, glade, vista.
  BORE, caliber or calibre; pore; blind orifice; fulgurite, thunder tube.
  HOLE, foramen; puncture, perforation; fontane or fontanelle; transforation; pinhole, keyhole, loophole, porthole, peephole, mousehole, pigeonhole; eye, eye of a needle; eyelet; slot.
  POROUSNESS, porosity; sieve, strainer, colander or cullender; cribble, riddle, screen; honeycomb.
  PERFORATION, apertion [archaic]; piercing &c. v.; terebration, empalement, pertusion [obs.], puncture, acupuncture, penetration.
  OPENER, key, master key, assepartout [F.], clavis, open-sesame.
   VERB:OPEN, ope [poetic], gape, yawn, hiate [rare], dehisce, bilge; fly open.
  PERFORATE, pierce, empierce [obs.], tap, bore, drill; mine &c. (scoop out) [See Concavity]; tunnel; transpierce, transfix; enfilade, impale, spike, spear, gore, spit, stab, pink, puncture, lance; trepan, trephine; stick, prick, riddle, punch; stave in.
  cut a passage through; make way for, make room for.
  UNCOVER, unclose, unrip, rip; lay -, cut -, rip -, throw- open.
   ADJECTIVE:OPEN; perforated &c. v.; perforate; wide open, patulous, agape, dehiscent, ringent; ajar, unclosed, unstopped; oscitant, gaping, yawning; patent.
  TUBULAR, cannular, fistulous; pervious, permeable; foraminous; vesicular, vascular; porous, follicular, cribriform, honeycombed, infundibular or infundibulate, riddled; tubulose or tubulous, tubulate or tubulated; piped, tubate, tubiform.
  OPENING &c. v.; aperient.
   INTERJECTION: open sesame! gangway! passageway!    QUOTATION:She open’d, but to shut Excell’d her power; the gates wide open stood.—Paradise Lost