There are numerous synonyms for the word "thereafter" that can be used in writing and conversation. Some common alternatives include "afterward," "subsequently," "following," "later on," "next," "then," "henceforth," and "from then on." Each of these synonyms provides different connotations and nuances to the meaning of the word. "Subsequently" suggests a chronological order while "henceforth" implies a permanent change. "Afterward" and "later on" are similar in meaning, but "next" and "then" stress the occurrence of an event in a sequence. Based on the context in which the word is used, one of these synonyms can be chosen to effectively communicate the intended meaning.