What is another word for "guardian"?

Roget's Thesaurus (1911) lists these synonyms for "guardian": abettor, accessory, accomplice, adherent, adjunct, adjutant, adjuvant, advocate, after, ally, alter, and, angel, assistant, associate, auxiliary, ayah, backer, bodyguard, bonne, candle, castellan, champion, clerk, coadjutor, coadjutrix, coast, collaborator, colleague, complice, concierge, confederate, confidant, confrere, cooperator, costa, court, criminal, custodian, custos.