defender, guardian, protector, shielder - a person who cares for persons or property

attorney general - the chief law officer of a country or state

border patrolman - someone who patrols the borders of a country

constable - a lawman with less authority and jurisdiction than a sheriff

deputy, deputy sheriff - someone authorized to exercise the powers of sheriff in emergencies

flatfoot, patrolman - a policeman who patrols a given region

gaoler, jailer, jailor, prison guard, screw, turnkey - someone who guards prisoners

police lieutenant, lieutenant - an officer in a police force

marshal, marshall - a law officer having duties similar to those of a sheriff in carrying out the judgments of a court of law

military policeman, MP - a member of the military police who polices soldiers and guards prisoners

narc, narcotics agent, nark - a lawman concerned with narcotics violations

police officer, policeman, officer - a member of a police force; "it was an accident, officer"

police sergeant, sergeant - a lawman with the rank of sergeant

sheriff - the principal law-enforcement officer in a county

solicitor general - a law officer appointed to assist an attorney general

Ranger, Texas Ranger - a member of the Texas state highway patrol; formerly a mounted lawman who maintained order on the frontier

warden, warder - the chief official in charge of a prison