What is another word for "rebus"?

Roget's Thesaurus (1911) lists these synonyms for "rebus": acquaintance, advocate, all, ally, alter, ambo, amigo, anagram, and, arcanum, associate, assorted, assortment, auxiliary, bedfellow, best, book, boon, bosom, casual, chamber, charade, childhood, chum, classman, classmate, colleague, companion, compatriot, compeer, comrade, concealed, confidante, confidential, confrere, conundrum, copartner, countryman, crack, crony.