Synonyms to keep guard

patrol, Argus, Charley, airplane spotter, beat, course, cover, defend, defending, do, fire patrolman, fire warden, fireguard, forward observer, go over, guard, guarding, keep vigil, keep watch, lookout, lookout man, measure, mount guard, night watchman, overpass, pass over, pass through, patroller, patrolman, perambulate, peregrinate, pererrate, picket, ply, police, protect, protecting, protection, range, range over, reconnoiter, rounds, roundsman, safeguarding, scour, scour the country, scout, sentinel, sentry, spotter, stand guard, stand sentinel, sweep, track, transit, travel over, travel through, traverse, vedette, vigilance, voyage, watch, watch over, watcher, watchfulness, watchkeeper, watchman, Cheka, FBI, Gestapo, Interpol, MP, MVD, Mounties, NKVD, OGPU, RCMP, SP, Scotland Yard, administer, arm, armor, bless, bull, champion, clean up, clear the decks, clear up, cloak, compass about, constabulary, control, cop, copper, copyright, county police, cushion, enforce, ensure, fence, fend, fix up, fuzz, groom, guarantee, harbor, haven, heat, highway patrol, insure, keep, keep from