Antonyms for the word "pre-script" may include words like "improvisation" or "extemporization" which refer to the act of speaking or performing without prior planning. Additionally, antonyms could include words like "post-script" or "afterthought" which refer to something added after the fact, rather than before. Other antonyms may include "spontaneity," "unplanned," or "unrehearsed." These words suggest a lack of structure or pre-planning, which is the opposite of "pre-script." By considering these antonyms, one can better understand the meaning of the term and the importance of planning in various aspects of life, including writing, performance, and organization.