The word "jussive" refers to a grammatical mood that expresses a command, request, or prohibition. Synonyms for this term include imperative, hortatory, exhortative, and optative. The imperative mood is used to give a direct command, while the hortatory and exhortative moods encourage or urge someone to do something. The optative mood expresses a wish or desire, which can be used as a softer way of giving a command. Other related terms include subjunctive, which is used to express a hypothetical situation, and declarative, which is used to state a fact or opinion. Overall, these synonyms help to convey different tones and intentions when expressing a command or request.