Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.
Class II. Words Relating to SpaceSection III. Form
3. Superficial Form
263. Stopper.
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.