is a specific kind of: defender, guardian, protector, shielder.

is a broader term that covers: attorney general | border patrolman | constable | deputy, deputy sheriff | flatfoot, patrolman | gaoler, jailer, jailor, prison guard, screw, turnkey | lieutenant, police lieutenant | marshal, marshall | military policeman, MP | narc, narcotics agent, nark | officer, police officer, policeman | police sergeant, sergeant | sheriff | solicitor general | Ranger, Texas Ranger | warden | warder ... show more.