What is another word for "acting"?

Roget's Thesaurus (1911) lists these synonyms for "acting": ablegate, accredit, act, action, agency, alter, answer, appear, archon, bear, behalf, brief, bring, causation, champion, chancellor, come, commissioner, consul, delegate, deputy, despair, director, doing, effect, effectual, efficacious, efficient, ego, eight, eleven, exercise, foot, for, force, free, friend, function, governor, have.