is a specific kind of: preserver.

is a broader term that covers: admonisher, monitor, reminder | bodyguard, escort | champion, fighter, hero, paladin | chaperon, chaperone | custodian, keeper, steward | fire-eater, fire fighter, firefighter, fireman | foster-parent, foster parent | guard | keeper | law officer, lawman, peace officer | patron saint | peacekeeper | tribune | watchdog ... show more.

derivation: protectorship | guardianship, keeping, safekeeping | care, charge, guardianship, tutelage | defend, fend for, support | protect | defend, guard, hold | screen, shield | champion, defend.