Patrolman

Noun

 * 1) A police officer, especially a junior one who does patrol instead of detection or supervising other policemen.

Thesaurus
Argus, Charley, G-man, John Law, MP, airplane spotter, bailiff, beadle, beagle, bound bailiff, captain, catchpole, chief of police, commissioner, constable, cop, deputy, deputy sheriff, detective, fed, federal, fire patrolman, fire warden, fireguard, flic, forward observer, gendarme, government man, inspector, lictor, lieutenant, lookout, lookout man, mace-bearer, marshal, mounted policeman, narc, night watchman, officer, patrol, patroller, peace officer, picket, police, police captain, police commissioner, police constable, police inspector, police matron, police officer, police sergeant, policeman, policewoman, portreeve, reeve, roundsman, scout, sentinel, sentry, sergeant, sergeant at arms, sheriff, spotter, superintendent, tipstaff, tipstaves, trooper, vedette, watch, watcher, watchkeeper, watchman

Etymology
patrol + man