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

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

263. Stopper.

   NOUN:STOPPER, stopple; plug, cork, bung, spike, spill, spile, stopcock, tap, faucet; rammer; ram, ramrod; piston; stop-gap; wadding, stuffing, padding, stopping, dossil, pledget, sponge [surg.], tampion or tompion, tourniquet.
  VALVE, vent peg, spigot, slide valve; cover [See Covering].
  DOORKEEPER, gatekeeper, janitor, janitress [fem.], janitrix [fem.], concierge [F.], porter, portress [fem.], warder, beadle, tiler or tyler [Freemasonry], durwan [Hind.], usher, guard, sentinel; beefeater, yeoman of the guard [Eng.]; Cerberus, watch dog, ostiary.