What is another word for "cerberus"?

Roget's Thesaurus (1911) lists these synonyms for "cerberus": beadle, bung, cork, cover, doorkeeper, dossil, janitor, ostiary, padding, peg, piston, pledget, plug, porter, ram, rammer, ramrod, slide, spigot, spike, spill, stop-gap, stopcock, stopper, stopping, stopple, stuffing, tap, tompion, tourniquet, valve, vent, wadding, warder.