What is another word for "pal"?

Roget's Thesaurus (1911) lists these synonyms for "pal": abettor, accessory, accomplice, acquaintance, adherent, adjunct, adjutant, adjuvant, advocate, after, against, all, ally, alter, ambo, amigo, and, angel, any, aquila, are, assistant, associate, auxiliary, backer, bad, bare, bedfellow, best, bizarre, boon, bosom, candle, casual, chamber, champion, chance, childhood, chum, classman.