There are various synonyms for the word "past", which pertains to something that has already occurred or has ended. Some of the common synonyms for past include previous, former, old, expired, finished, completed, gone, and outdated. Each of these alternatives conveys a sense of time that has already passed, emphasizing that something is no longer present or relevant. For instance, the word "former" implies a prior status or position, while "outdated" suggests that something is no longer in use or fashionable. Overall, having a diverse vocabulary of synonyms for the word "past" can help add nuance and complexity to written and spoken communication.