What is another word for "acquaintance"?

Roget's Thesaurus (1911) lists these synonyms for "acquaintance": advocate, all, ally, alter, ambo, amigo, and, associate, auxiliary, bedfellow, best, boon, bosom, casual, chamber, childhood, chum, classman, classmate, colleague, companion, compatriot, compeer, comrade, confidante, confrere, copartner, countryman, crony, divine, ego, familiar, fast, fautor, favorer, fellow, friend, genius, good, guest.