What is another word for "senior"?

Roget's Thesaurus (1911) lists these synonyms for "senior": abecedarian, acquaintance, advocate, all, ally, alphabetarian, alter, alumnus, amateur, ambo, amigo, and, apostle, apprentice, articled, associate, auditor, auxiliary, bedfellow, beginner, best, boon, bosom, casual, catechumen, chamber, chela, childhood, chum, class, classman, classmate, clerk, colleague, college, companion, compatriot, compeer, comrade, condisciple.