Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class V. Words Releasing to the Voluntary Powers
Division (II) Intersocial Volition
Section I. General Intersocial Volition

753. Keeper.

   NOUN:KEEPER, custodian, custos [L.], ranger, gamekeeper, warder, jailer or gaoler, turnkey, castellan, guard; watch, watchdog, watchman, night watchman, Charley or Charlie [Brit.]; chokidar [Anglo-Ind.], durwan [Anglo-Ind.], hayward; sentry, sentinel, watch and ward; concierge [F.], coastguard.
  ESCORT, bodyguard; convoy.
  GUARDIAN, protector, governor, duenna; governess (teacher) [See Teacher]; nurse, bonne [F.], amah [Oriental], ayah [India].
   QUOTATION:Am I my brother’s keeper?—Bible