What is another word for "rescript"?

Roget's Thesaurus (1911) lists these synonyms for "rescript": acknowledge, acknowledgment, answer, antiphon, antiphony, because, billet, billet-doux, bulletin, card, cause, chit, chitty, circular, clue, conclusive, correspond, correspondence, counter, despatch, determine, discover, discovery, dispatch, echo, epistle, epistolary, eureka, explain, explanation, fathom, favor, for, give, hunt, indication, inquire, interpret, keep, letter.